text:
# Proving matrix factorization using Schur complement

In my studies of matrix analysis I came across this problem:

Let $A$ be a real symmetric matrix which is also positive semidefinite and we are asked to prove, by induction on the dimension of $A$ that there exist the following factorization $A=LL^T$ and $A=UU^T$ where $L,U$ are lower and upper triangular matrices, respectively. We are instructed to prove this fact using the Schur complement, which is defined for the following block matrix $A = \left( \begin{array}{ccc} B & C \\ C^T & E \end{array} \right)$ where $E$ is principal square submatrix of $A$ the Schur complement is defined as $A/E = B-CE^{\dagger}C^T$ where $E^{\dagger}$ is the Moore-Penrose generalized inverse.

To be honest I have no idea how to prove this factorization using the assumption A is positive semidefinite and I have no idea how to carry out the induction using the Schur complement. I appreciate all help on this.


text:
# Drawing commutative left triangle

Here is the figure I want to draw:

I do not know exactly from which vertex should I start drawing. Could anyone show me how to draw this please?

• You have to consider a square with top left corner empty, so no arrows pointing from/to there. Feb 12 at 13:00
• @Sigur Can you show me how can I do that please? Feb 12 at 13:46
• As a recommendation, this commutative diagram generator can be very helpful both for not having to write code yourself as well as checking how you would go about writing it. Feb 12 at 22:13
• @tolUene thank you ! Feb 13 at 1:29
• "I do not know exactly from which vertex should I start drawing" >> you can start drawing from any vertex, as same as the way you choose the origin when you solving analytic geometry problems: choose any that you think fit. However, to start drawing that commutative diagram, a search in this texSE site with keyword "commutative diagram" will list a lot of how-to involving questions Feb 13 at 7:36

%\documentclass{article}
\documentclass[margin=3.1415692mm,varwidth]{standalone}
\usepackage{tikz-cd}

\begin{document}
\begin{tikzcd}
& P \ar[dl, dashed, "\tilde{f}" ']
\ar[d, "f"]     \\
\end{tikzcd}
\end{document}

%\documentclass{article}
\documentclass[margin=3.1415692mm,varwidth]{standalone}% show only image
\usepackage{tikz-cd}

\begin{document}
\begin{tikzcd}
& P \ar[dl, dashed, "\tilde{f}" ']  \\
A \ar[r,twoheadrightarrow,"g" ']    & B \ar[u, "f" ']
\end{tikzcd}
\end{document}

Note: for MWE (Minimal Working Example) is used standalone document class because it show only image with small border and not complete page as it happens at other document classes. However, proposed solution work at all other document classes. If you like to see result at article document class, just uncomment first line of MWE and comment the second line (with inserting % at beginning of second line).

• Should I remove document class {article} from my file to draw this? Feb 12 at 15:18
• +1 for "margin=3.1415692mm" Feb 12 at 15:34
• @Smart20 No, you can keep your article class. Feb 12 at 15:35
• but it is giving me error@Dr.ManuelKuehner Feb 12 at 15:36
• @Smart20 Replace the complete line "\documentclass[margin=3.1415692mm,varwidth]{standalone}" Feb 12 at 15:45

Here there are two (2) MWE using xy package with the same tips of the tikz-cd in function of your tastes.

\documentclass[a4paper,12pt]{article}
\usepackage[all,cmtip]{xy}
\begin{document}
\xymatrix@R=2.3pc@C=2.7pc{
& P \ar[d]^f \ar@{-->}[dl]_{\tilde{f}}\\
A \ar@{>>}[r]_g & B
}

\xymatrix@R=2.3pc@C=2.7pc{
& P \ar[d]^f \ar@{.>}[dl]_{\tilde{f}}\\
A \ar@{>>}[r]_g & B
}
\end{document}

format: plain


text:
# Verification - test suite ¶

## Measuring conformance ¶

In addition to the specification documents, a test suite is being developed to aid library developers check conformance to the spec. NOTE: The test suite is still a work in progress. It can be found at https://github.com/data-apis/array-api-tests .

It is important to note that while the aim of the array API test suite is to cover as much of the spec as possible, there are necessarily some aspects of the spec that are not covered by the test suite, typically because they are impossible to effectively test. Furthermore, if the test suite appears to diverge in any way from what the spec documents say, this should be considered a bug in the test suite. The specification is the ground source of truth.

## Running the tests ¶

To run the tests, first clone the test suite repo , and install the testing dependencies,

pip install pytest hypothesis

or

conda install pytest hypothesis

as well as the array libraries that you want to test. To run the tests, you need to specify the array library that is to be tested. There are two ways to do this. One way is to set the  ARRAY_API_TESTS_MODULE  environment variable. For example

ARRAY_API_TESTS_MODULE=numpy pytest

Alternatively, edit the  array_api_tests/_array_module.py  file and change the line

array_module = None

to

import numpy as array_module

(replacing  numpy  with the array module namespace to be tested).

In either case, the tests should be run with the  pytest  command.

Aside from the two testing dependencies (  pytest  and  hypothesis  ), the test suite has no dependencies. In particular, it does not depend on any specific array libraries such as NumPy. All tests are run using only the array library that is being tested, comparing results against the behavior as defined in the spec. The test suite is designed to be standalone so that it can easily be vendored.


text:
# Distance between a point and a circle circumference given angle from point

Let us assume that I have a circle with radius $r$ and centre $C$ and a point $P$. How can I find the length of the line segment starting from $P$ with a specific angle $\theta$, ending on the circumference of the circle (assuming that I chose the angle so that is the case). If the line intersects twice (that is if it is not a tangent), I want the distance to the closest point.

I know that I can easily find the angle and distance between the points, but I am not sure how it will help me. I also assume that the approach consists of finding the point where the line and circle intersects in order to find the distance between the points.

UPDATE: $P$ can be where ever in the plane as long as it is outside the circle. $\theta$ is measured according to the x-axis (I'm not sure that is a very accurate description, ask if you do not understand)

• How do you define the $\theta$ angle the line makes with the circumference, and are there conditions on $P$? – Parcly Taxel Nov 4 '16 at 12:15
• Presumably you are given something like $d(P,C)$? If $X$ is the point on the circle then however you define $\theta$ you can use it to compute $\angle CXP$, no? So you can invoke the law of cosines. – lulu Nov 4 '16 at 12:15
• I am not sure I get what you are asking, lulu. But it is no problem for me finding the (euclidean) distance between the centre of the circle and the point.... Oh you updated your question. I don't have X, that is my problem. The angle is from the point not on the circl.e – playdoe Nov 4 '16 at 12:20
• Oh, I think i was just being stupid, I see what you mean now. I will check it out, and if it makes sense for me I will accept your answer. – playdoe Nov 4 '16 at 12:31

On an $x,y$ Cartesian plane, suppose we are given the coordinates of a point $C$, the radius $r$ of a circle around $C$, the coordinates of a point $P$ outside the circle, and a ray $\overrightarrow{PQ}$ starting at $P$ at an angle of $\theta$ clockwise from the $x$-axis. (The coordinates of $Q$ need not be known; it is used here just as a way to name a particular ray starting at $P$.)

Find the distance $d$ from $P$ to $C$ and the direction $\theta_0$ (clockwise from the $x$-axis) of the ray $\overrightarrow{PC}$ from $P$ through $C$. Compute the angle $\alpha$ between the rays $\overrightarrow{PQ}$ and $\overrightarrow{PC}$; it is $\lvert \theta - \theta_0 \rvert$, $\lvert \theta - \theta_0 + 2\pi \rvert$, or $\lvert \theta - \theta_0 - 2\pi \rvert$, whichever is smallest.

If $\alpha \geq \frac\pi2$ then there is no intersection, so we're done. In all of the discussion below, assume that $\alpha < \frac\pi2$.

If $M$ is the point on ray $\overrightarrow{PQ}$ closest to $C$, the triangle $PMC$ is a right triangle with a right angle at $M$ and the angle $\alpha$ at $P$. Therefore the distance $CM = d \sin \alpha$ and the distance $PM = d \cos\alpha$. (Note that we compute all of this without needing to find the coordinates of $M$.)

If $d \sin \alpha > r$ then there is no intersection. If $d \sin \alpha = r$ then the ray $\overrightarrow{PQ}$ is tangent to the circle, $M$ is the point of tangency and is one endpoint of the line segment, and the distance $PM$ is $d \cos \alpha$.

If $d \sin \alpha < r$ then ray $\overrightarrow{PQ}$ intersects the circle in two points. One of these points is between $P$ and $M$; call that point $X$. Then $XMC$ is a right triangle with hypotenuse $XC = r$ and leg $CM = d \sin \alpha$; the length of the other leg is therefore $XM = \sqrt{r^2 - d^2 \sin^2 \alpha}$. Therefore $$PX = PM - XM = d \cos \alpha - \sqrt{r^2 - d^2 \sin^2 \alpha},$$ which is the distance we were to find.

The equation of the line can be written $$\mathbf{X}(t) = \mathbf{P} + t(\cos\theta, \sin\theta)$$ If $\mathbf{P} = (a,b)$, then this becomes \begin{align} x &= a + t \cos\theta \\ y &= b + t \sin\theta \\ \end{align} Suppose the circle center is at $\mathbf{C} = (h,k)$ and its radius is $r$. Then it's equation is $$(x-h)^2 + (y-k)^2 = r^2$$ Substitute $x$ and $y$ from above into this equation, and you'll get a quadratic in $t$. Find its real roots $t_1$ and $t_2$ (if any). Then the intersection points are $\mathbf{P} + t_i(\cos\theta, \sin\theta)$ for $i=1,2$.


text:
# chemtools.conceptual.base.BaseCondensedTool¶

class chemtools.conceptual.base.BaseCondensedTool(n0, n_max=None, global_softness=None)[source]

Base class of condensed conceptual DFT reactivity descriptors.

Initialize class.

Parameters: n0 (float) – Reference number of electrons, i.e. $$N_0$$. n_max (float, optional) – Maximum number of electrons that system can accept, i.e. $$N_{\text{max}}$$. See BaseGlobalTool.n_max. global_softness (float, optional) – Global softness. See BaseGlobalTool.softness.
n_ref

Reference number of electrons, i.e. $$N_0$$.

n_max

Maximum number of electrons that the system accepts, i.e. $$N_{\text{max}}$$.

global_softness

Global softness.

population(n_elec)[source]

Evaluate atomic populations at the given number of electrons $$N_{\text{elec}}$$.

..math::
N_A = Z_A - int w_A(mathbf{r}) rho_N(mathbf{r}) dmathbf{r}

where $$w_A(\mathbf{r})$$ is the atomic weight of atom $$A$$ at point mathbf{r}.

Parameters: n_elec (float) – Number of electrons, $$N_{\text{elec}}$$.
population_derivative(n_elec, order=1)[source]

Evaluate n-th derivative of atomic populations w.r.t. number of electrons.

The n-th order derivative of atomic populations $$\rho_N(\mathbf{r})$$ w.r.t. the number of electrons, at fixed chemical potential, evaluated at the given number of electrons $$N_{\text{elec}}$$ is:

$\left. \left(\frac{\partial^n \rho_N(\mathbf{r})}{\partial N^n} \right)_{v(\mathbf{r})}\right|_{N = N_{\text{elec}}}$
Parameters: n_elec (float) – Number of electrons, $$N_{\text{elec}}$$. order (int, optional) – The order of derivative denoted by $$n$$ in the formula.

Note

For $$N_{\text{elec}} = N_0$$ the first, second and higher order density derivatives correspond to the condensed fukui function, dual descriptor and hyper fukui function, respectively.

fukui_function

Atomic Fukui function of $$N_0$$-electron system.

This is defined as the 1st derivative of density model $$\rho_N(\mathbf{r})$$ w.r.t. the number of electrons, at fixed external potential, evaluated at $$N_0$$, or the functional derivative of chemical potential w.r.t. external potential, at fixed number of electrons, i.e.

$f_{N_0}(\mathbf{r}) = {\left( \frac{\delta \mu}{\delta v(\mathbf{r})} \right)_N} = \left. \left(\frac{\partial \rho_N(\mathbf{r})}{\partial N} \right)_{v(\mathbf{r})}\right|_{N = N_0}$

where $$\mu$$ is the chemical potential.

dual_descriptor

Atomic dual descriptor of $$N_0$$-electron system.

This is defined as the 2nd derivative of density model $$\rho_N(\mathbf{r})$$ w.r.t. the number of electrons, at fixed external potential, evaluated at $$N_0$$, or the functional derivative of chemical hardness w.r.t. external potential, at fixed number of electrons, i.e.

$\Delta f_{N_0}(\mathbf{r}) = {\left( \frac{\delta \eta}{\delta v(\mathbf{r})} \right)_N} = \left. \left(\frac{\partial^2 \rho_N(\mathbf{r})}{\partial N^2} \right)_{v(\mathbf{r})}\right|_{N = N_0}$

where $$\eta$$ is the chemical hardness.

softness

Atomic chemical softness of $$N_0$$-electron system.

$s_A\left(N\right) = S \cdot f_A\left(\mathbf{r}\right)$

where $$S$$ is the global softness.

hyper_softness

Chemical hyper-softness of $$N_0$$-electron system, $$s_N^{(2)}(\mathbf{r})$$.

$s_N^{(2)}\left(\mathbf{r}\right) = S^2 \cdot \Delta f_N\left(\mathbf{r}\right)$

where $$S$$ is the global softness and $$\Delta f_N$$ is the dual descriptor.


text:
This is a pre-production deployment of Warehouse. Changes made here affect the production instance of PyPI (pypi.python.org).
Help us improve Python packaging - Donate today!

A command-line alarm clock.

Project Description

eAlarm is a simple, easy (thus the ‘e’) alarm that does what any alarm should do. It’s used from the command-line, because ‘ctrl-c’ is still perfectly accessible in the dark.:

----------
ON *NIX
----------

$eAlarm OR$ python /path/to/eAlarm.py /optional/absolute/path/to/directory

OR

\$ python /path/to/eAlarm.py
>>> Enter a directory you'd like to sort: absolute/path/to/directory

-----------
ON WINDOWS:
-----------

Open a command prompt and type:

C:\path\to\python.exe C:\path\to\eAlarmgui.py

OR

C:\path\to\python.exe C:\path\to\eAlarm.py

(Or just double-click on whichever script)

## Installation:

• In Unix: Unpack the tarball, open a terminal, navigate to the directory in which you unpacked the tarball, and type (as admin, i.e., “su” or “sudo”) python setup.py install
• In Windows, just run the .exe as normal. The script will be installed to C:\Pythondir\Lib\site-packages

### Usage

This program can be used interactively, or quickly.

For the former, simply execute the program with no arguments. You’ll be brought to the intro page and presented with a few options. You can just ‘go’, you can set the time (or any one of the nine preset times), or you can quit.

For the latter, you can pass the program a time straight from the command-line. To do so, you’d pass a time argument while invoking it. For example, to immediately set the clock for 4:00 PM, you can type ‘ealarm 16:00’, ‘ealarm 4pm’, ‘ealarm 16’, etc. It will also accept ‘noon’ or ‘midnight’ as a time argument.

One other possibly important option is the ‘test’ option, to see whether or not the alarm will actually function on your system. Better safe than sorry, right? You can enter ‘T’ at the main (interactive) screen, or just type ‘ealarm t’ from the command line. If after several seconds you still don’t hear anything, then you may want not want to use this program.

There isn’t much more to it than that, honestly. It’s a simple little alarm.

After installation and running the program for the first time (or just running the script itself from wherever you’ve extracted it to), a configuration file will be created in the ealarm directory, located in one of the following directories:

GNU/Linux: ~/.ealarm

Windows XP: My Documents\ealarm

Windows 7 or Vista: Documents\ealarm

You can edit the configuration file if you’d like (named ‘ealarm.cfg’) with any plain text editor. You can set the ring sound, current time and preset times inside this cfg file.

### Author

• x.seeks (x -dot- seeks _at_ gmail -dot- com)

Release History

This version

0.1.0


text:
### Author Topic: TUT0601 quiz3  (Read 1343 times)

#### Mingzhu Yu

• Newbie
• Posts: 3
• Karma: 0
##### TUT0601 quiz3
« on: October 11, 2019, 11:50:08 PM »
Give the general solution for this question:
$$4 y^{\prime \prime}-y=0, y(-2)=1, y^{\prime}(-2)=-1$$
The given initial value problem is
$$4 y^{\prime \prime}-y=0---(1)$$
$$y(-2)=1---(2)$$
$$y^{\prime}(-2)=-1---(3)$$
We assume that $y=e^{r t}$ is a solution of equation(1)
Now $y=e^{r t}$
Then $y^{\prime}=r e^{r t}$
And $y^{\prime \prime}=r^{2} e^{n}$
Using these values in equation(1),
$$4 r^{2} e^{r t}-e^{r t}=0$$
i.e. $e^{r t}\left(4 r^{2}-1\right)=0$
Since $e^{r t} \neq 0$
Then $4 r^{2}-1=0$
which is the characteristic equation for the differential equation(1)
Now $4 r^{2}-1=0$ gives
$$4 r^{2}=1$$
i.e. $r^{2}=\frac{1}{4}$
i.e. $r=\pm \frac{1}{2}$
i.e. $r=\frac{1}{2}, \frac{-1}{2}$
Then we see that $y=e^{t / 2}$ and $y=e^{-t / 2}$are two solutions of equation(1)
Then the general solution is given by
$$y=c_{1} e^{t / 2}+c_{2} e^{-t / 2}---(4)$$
Using initial condition(2),
$$y(-2)=1$$
i.e. $1=c_{1} e^{-1}+c_{2} e---(A)$
Also from equation(4)
$$y^{\prime}=\frac{c_{1}}{2} e^{t / 2}-\frac{c_{2}}{2} e^{-t / 2}$$
Using initial condition(3)
$$y^{\prime}(-2)=-1$$
i.e. $-1=\frac{c_{1}}{2} e^{-1}-\frac{c_{2}}{2} e---(B)$
Solving equation(A)and(B)simultaneously,we have
$$c_{1}=\frac{-1}{2} e$$
And $c_{2}=\frac{3}{2} e^{-1}$
Hence the general solution is
$$y=\frac{-1}{2} e^{1} e^{t / 2}+\frac{3}{2} e^{-1} e^{-t / 2}$$
Or $y=\frac{-1}{2} e^{\frac{(t+2)}{2}}+\frac{3}{2} e^{-\frac{(t+2)}{2}}$


text:
# How to get the maximum luminance out of a LED?

What is the formula to obtain the resistor value I should use to drive a LED to its maximum luminance for a given input voltage?

And for the maximum power effectiveness (luminance / watt)?

-
A resistor value will not give you the maximum luminance for a given amount of power. You need to pulse a constant current driver at a few hundred hertz instead. By using a small duty cycle, you can run the LED at much more than its maximum sustainable power level, which will make it appear brighter on average. I'd recommend editing the title to reflect this, something like "Calculating resistor values for maximum LED luminance". See this Intersil app note for an example of a more complex, efficient, and bright driver. –  Kevin Vermeer Dec 13 '10 at 17:37
@reemrevnivek: Pulsing LEDs doesn't increase the apparent brightness. members.misty.com/don/ledp.html The eye perceives the average brightness over time. –  endolith Dec 13 '10 at 17:47
@reemrevnivek in particular, LEDs have a peak current rating which is typically higher than the maximum DC current rating - however, this limit is often caveated by a maximum duty cycle (often <=30%). So it's a tradeoff and really depends on the particular device parameters. –  vicatcu Dec 13 '10 at 18:49
Also note that pulse width regulation is a lot more power efficient than using a resistor, so it's going to be preferred when trying to get a lot of light from something battery powered like a bicycle safety light. –  Chris Stratton Dec 13 '10 at 19:00

I assume you're talking about the basic resistor voltage regulator. A basic equation for the resistor's value would involve the LED minimum forward voltage (Vf), LED maximum current (If), and power supply maximum voltage (Vs).

R = (Vs - Vf) / If

With supply voltages nearly equal to the LED voltage, it is somewhat hairy as the current may become overly sensitive to the resistor, so I would avoid going below 100 ohms. A very conservative equation would be as above, but set Vf to zero.

The maximum luminous efficiency of the LED alone would obviously depend on the LED itself, so you would have to look at the datasheet. For the maximum efficiency of the system as a whole, if driving more than a few LEDs (or any >100 mA LEDs) it would be best to use a switching regulator with current sensing.

-
R = (Vcc - Vf) / If


text:
27 Jul 2016  ·  Junegone Chay, Taewook Ha, Taehyun Kwon ·

The factorization theorem for the dijet cross section is presented in hadron-hadron collisions with a cone-type jet algorithm. We also apply the beam veto to the beam jets consisting of the initial radiation... The soft-collinear effective theory is employed to see the factorization structure transparently when there are four distinct lightcone directions involved. There are various types of divergences such as the ultraviolet and infrared divergences. And when the phase space is divided to probe the collinear and the soft parts, there appears an additional divergence called rapidity divergence. These divergences are sorted out and we will show that all the infrared and rapidity divergences cancel, and only the ultraviolet divergence remains. It is a vital step to justify the factorization. Among many partonic processes, we take $q\overline{q} \rightarrow gg$ as a specific example to consider the dijet cross section. The hard and the soft functions have nontrivial color structure, while the jet and the beam functions are diagonal in operator basis. The dependence of the soft anomalous dimension on the jet algorithm and the beam veto is diagonal in operator space, and is cancelled by that of the jet and beam functions. We also compute the anomalous dimensions of the factorized components, and resum the large logarithms to next-to-leading logarithmic accuracy by solving the renormalization group equation. read more

PDF Abstract


text:
# USART interrupt not working as expected [STM32 Nucleo]

could someone explain why i can only receive 13 chars with USART interrupt? I use '\n' to detect the end of string.

#define BUFFER_SIZE 100

for(;;){
HAL_Delay(50);
HAL_Delay(50);
HAL_UART_Transmit_IT(&huart2, (uint8_t *)"\r\n", strlen("\r\n"));
}
}
}

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart) {

if (huart->Instance == USART2){
}else{
}
}
}

void USART2_IRQHandler(void){

HAL_UART_IRQHandler(&huart2);
}

• What happens when you send it without the CR or in smaller chunks? Jan 25 '18 at 13:53
• Funny that you say that you check for \n but your code is checking for \r which is 13 and you only process 13 bytes, but then why is strlen giving more than 13 and sends some 0x00 bytes with them (<0>) - the message you get back is the length of the transmitted message just the content of the last 3 bytes is wrong. Jan 25 '18 at 13:54
• @Trevor_G if i send in smaller chunks (less then 14) it is ok, everything works fine. And if i send without CR it doesn't appear at all. Jan 25 '18 at 14:02
• Ya I meant if you send 12345678 then send 12345678 +CR what do you get back. Jan 25 '18 at 14:05
• Good catch...thats exactly why things got worse at slower baudrate, overflow happened at the rxbuffer on PC side. Jan 25 '18 at 15:16

I found the problem. In the void USART2_receive(void const * argument) function i increased delay from 50 to 100 and then everything works fine. As @MITURAJ mentioned this may be caused by buffer overflow.

void USART2_receive(void const * argument){
for(;;){
HAL_Delay(100);
HAL_Delay(100);
HAL_UART_Transmit_IT(&huart2, (uint8_t *)"\r\n", strlen("\r\n"));
}
}
}

• What is the purpose of the delay, and why did increasing it fix the problem? Jan 25 '18 at 15:45
• I just don't know how to mark someone comment as helpful answer Jan 25 '18 at 16:39

Finding that you need a longer delay should tip you off that you are not waiting for the Tx to actually finish. HAL_UART_Transmit_IT uses an interrupt to send bytes out (it is non-blocking). You are basically telling it to transmit, waiting a little bit, and cramming data into the buffer again before the transmit is done!

Instead I suggest that you monitor the callback to HAL_UART_TxCpltCallback and once that happens set some flag. In your USART2_receive function, wait for the flag to be set before asking it to send things again. Remember to clear the flag before waiting for it to be set again :)

• Thank you for detail explanation, it quite tought to implement these changes as i am junior developer. Maybe there is any examples which i could follow for this feature? Jan 31 '18 at 17:50
• @Into_Embedded, it is pretty straight forward, it is like the HAL_UART_RxCpltCallback function. The CubeMx probably generates the TxCpltCallback function for you and you just have to fill it out. Take a look at the STM32 examples too, there should be something there for non-blocking UART. Feb 1 '18 at 23:27
• i will definetly look into now it doesn't look so taught as it looked first. Feb 1 '18 at 23:32


text:
# Historical average with exponential smoothing model [duplicate]

This topic similar with this one R Time Series Analysis forecast result always remains same But I perfrom exponential smoothing model in R.

df=structure(list(date = structure(1:12, .Label = c("01.01.2017",
"01.02.2017", "01.03.2017", "01.04.2017", "01.05.2017", "01.06.2017",
"01.07.2017", "01.08.2017", "01.09.2017", "01.10.2017", "01.11.2017",
"01.12.2017"), class = "factor"), value = c(200L, 100L, 460L,
300L, 280L, 280L, 140L, 180L, 80L, 80L, 180L, 60L), common = structure(c(1L,
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L), .Label = "158150- 01195т", class = "factor")), .Names = c("date",
"value", "common"), class = "data.frame", row.names = c(NA, -12L
))

i perform forecast for each groups separately) using ets function from forecast package (common is grouping variable)

here forecast for initial dataset

it is wrong result, but the main is that forecast on 1 year age ahead has static values(like historical mean)

How can i understand why forecast show same value in exponential smoothing model. Is it possible to fix it?

I can provide my R code, if it is needed.

• ets() probably selects a non-seasonal and non-trended model, which yields flat line forecasts. Here are a few similar questions and answers (from me). – Stephan Kolassa Jan 10 '19 at 13:17
• @StephanKolassa, i will check i and write you. – cbool Jan 10 '19 at 14:08
• @StephanKolassa,can forecast package set seasonal model using ets()? i can see where do it in argument. – cbool Jan 10 '19 at 14:11
• You can force ets() to use an additive seasonal model with the parameter model="ZZA", or a multiplicative one using model="ZZM". Unfortunately, there is no way to specify either one. However, if ets() chooses a non-seasonal model, it will likely have good reasons for it. I would be skeptical about being able to improve on its model selection. Do seasonal models truly improve out-of-sample forecast accuracy? – Stephan Kolassa Jan 10 '19 at 15:35
• Incidentally, does your time series structure have the correct frequency attribute? If not, then ets() will not do anything seasonal. Why Does ETS Say My Data Has No Seasonality? – Stephan Kolassa Jan 10 '19 at 15:37


text:
# How do you solve the following system?:  y=4x- 6 , y=x-2

Mar 5, 2016

#### Answer:

$x - 2 = 4 x - 6 \to 3 x = 4 \to x = \frac{4}{3}$

#### Explanation:

Use substitution method and equate the two equations then combine like terms and solve for x


text:
# Use power series to evaluate the indefinite integral. What is the radius of convergence? \int...

## Question:

Use power series to evaluate the indefinite integral. What is the radius of convergence? {eq}\int \frac {t}{1-t^3} dt {/eq}

## Indefinite Integral:

The series representation of the indefinite integral will have the integration constant c along with the series form. then the interval of convergence and the radius of convergence of the series can also be found.

We have the indefinite integral:

{eq}\displaystyle \int \frac {t}{1-t^3} dt \\ {/eq}

So to integrate, we can use the series form by the help of the series expansion formula:

{eq}\displaystyle \left(1-x\right)^{-1} = \sum _{n=0}^{\infty }\:x^n\\ {/eq}

So the integral of the series form will be given by:

{eq}\int \frac {t}{1-t^3} dt\\ \displaystyle = \int t ((1-t^3))^{-1} dt\\ \displaystyle =\int t (\sum _{n=0}^{\infty }\:(-t^3)^n) dt\\ \displaystyle =\int (\sum _{n=0}^{\infty }\:(-1)^n(t^{3n+1})) dt\\ \displaystyle =\sum _{n=0}^{\infty }\:(-1)^n\frac{(t^{3n+1+1})}{3n+1+1}+c \\ \displaystyle =\sum _{n=0}^{\infty }\:(-1)^n\frac{(t^{3n+2})}{3n+2}+ c \\ {/eq} Here c is the integral constant.

So this is the series form of the given indefinite integral, whose radius of convergence is given by the ratio test as follows:

{eq}\displaystyle \lim _{n\to \infty }|\frac{a_{n+1}}{a_n}|\\ \displaystyle = \lim _{n\to \infty \:}\left(\left|\frac{\left(-1\right)^{\left(n+1\right)}\frac{t^{3\left(n+1\right)+2}}{3\left(n+1\right)+2}}{\left(-1\right)^n\frac{t^{3n+2}}{3n+2}}\right|\right)\\ \displaystyle =\lim _{n\to \infty \:}\left(\left|-\frac{t^3\left(3n+2\right)}{3n+5}\right|\right)\\ =\left|t^3\right|\\ {/eq}

Then we apply the convergence condition:

{eq}\left|t^3\right|<1\\ \Rightarrow -1<t<1 {/eq}

is the required convergence interval.


text:
When we sit down to write code we all desire coding nirvana, where the world around us melts away and we achieve an inner peace, the code appearing to write itself.

One of the obstacles to reaching such a relaxed and focused mental state is distraction from noise. Like a toddler incessantly poking your arm, it robs you of your attention.

This is why headphones are essential gear for programmers.

They enable us to shut out the world and concentrate on the code, making coding nirvana easier to attain. But with so many different types of headphones on the market, how do we know which ones to choose? Are some better than others for programmers?

# Types of headphones

There are four different types of headphones, and knowing how these types affect sound isolation is essential for understanding which are more suitable for programmers.

Earbuds sit loosely in the outer-ear facing, but not inserted into, the ear canal. They provide almost no isolation.

In-ear monitors are inserted into the ear-canal, forming a tight seal, passively isolating a lot of external noise.

Supra-aural headphones have small ear pads that sit on the ears, passively isolating some but not all noise.

Circumaural headphones have large ear pads that encompass the ears, forming a tight seal, passively isolating a lot of external noise.

Supra-aural and circumaural can also be either open or closed, and this has a dramatic affect on sound.

Open headphones have an open back which allows sound to enter and exit the headphone. This improves sound quality, but also reduces isolation for the listener, and subjects those around you to your music.

# Active noise-canceling

Headphones with active noise-canceling technology use microphones placed around the headset to pick up external noise, and use digital signal processing to cancel it out.

It would seem natural to assume that noise-canceling headphones offer the best solution; however, this isn't necessarily true.

They shine at canceling out low-frequency repetitive sounds. Background noise like the hum of an airplane engine or air-conditioning fall into this category. It's surreal when you take off active noise-canceling headphones and the background noise you didn't realize was there floods back in.

However, active noise-canceling headphones are poor at removing high-frequency and irregular sounds. The unpredictable sound of people talking or crying babies are good examples of this. The sound is dampened, but it's still there.

Given that programmers are distracted by talking colleagues and the click-clack of keyboards, especially those unfortunate enough to work in the nightmare open plan office, active noise-canceling headphones don't offer much noise isolation benefits over their passive isolating counterpart.

You're also paying a premium for the noise-canceling technology. When compared with passive isolating headphones in the same price range, both the sound and build quality suffer in the active noise-canceling pair.

Take the market-leading active noise-canceling Bose Quiet Comfort 35 ($349.95) and the passive noise isolating Bower & Wilkins P7 ($399.99) as an example. While the Bose headphones aren't by any means poor quality, the plastic and "protein leather" construction feels much less premium than the aluminum and sheepskin leather of the P7. And the sound quality is the difference between good and great.

# Sound shape

Reaching coding nirvana can also depend on the shape of the sound the headphones produce. It doesn't help if you're isolated from your environment but the sound doesn't takeover your senses, pulling you in.

The shape of the sound is described in terms of which frequencies are given more emphasis. Warm-sounding headphones emphasize the bass whereas bright-sounding headphones emphasize trebles.

In between you have neutral headphones which have an overall balanced sound, V-shaped which emphasize both bass and treble, and others that focus on the mids.

The sound shape that helps you reach coding nirvana will depend on the music you enjoy and your preferences. Try as many headphones as possible to discover what works for you, and what doesn't.

# So what's best?

IEMs and closed circumaural headphones provide the best passive noise isolation of the four types of headphones, which makes them ideal for programmers.

Active noise-canceling is a fascinating technology, but it doesn't help any more than IEMs and closed circumaurals at isolating sounds that programmers have problems with.

Given that IEMs and circumaurals also offer superior sound and build quality in the same price range, it makes it difficult to recommend active noise-canceling headphones for programming.

However...

Headphones are about as personal as it gets. What sounds ground-breaking to one can make another's ears bleed (not literally). And if you travel, perhaps the noise-isolation is something you can't miss. The only way to find out is to get out there and try them all out.

Hopefully this article gives you something to consider while you search for the perfect headphones. After weeks of research and trying out several headphones, I settled on the Oppo PM-3 and couldn't be happier.

For more information about headphones, I highly recommend you check out innerfidelity.com and head-fi's Headphone buying guide, as well as /r/headphones.


text:
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The magnesium supplementation was harmful enough to do a lot of cumulative damage over the months involved (I could have done a lot of writing September 2013 - June 2014), but not so blatantly harmful enough as to be noticeable without a randomized blind self-experiment or at least systematic data collection - neither of which are common among people who would be supplementing magnesium I would much prefer it if my magnesium overdose had come with visible harm (such as waking up in the middle of the night after a nightmare soaked in sweat), since then I’d know quickly and surely, as would anyone else taking magnesium. But the harm I observed in my data? For all I know, that could be affecting every user of magnesium supplements! How would we know otherwise? Cameras Steroid Alt January 6, 2018 Jump up ^ "Smart Drugs and Should We Take Them?". Dolan DNA Learning Center. Retrieved November 4, 2012. 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text:
# How can we escape special characters in MySQL statement?

MySQLMySQLi Database

Sometimes we need to include special characters in a character string and at that time they must be escaped or protected. We need to pursue some basic rules for escaping special characters which are given below −

## The escape character (\) can be escaped as (\\)

### Example

mysql> Select 'A\\B';
+-----+
| A\B |
+-----+
| A\B |
+-----+
1 row in set (0.00 sec)
Published on 22-Feb-2018 07:42:13


text:
# Joint Differential Equations#

In a dynamical system, there may be multiple variables that change dynamically over time. Sometimes these variables are interconnected, and updating one variable requires others as the input. For example, in the widely known Hodgkin–Huxley model, the variables $$V$$, $$m$$, $$h$$, and $$n$$ are updated synchronously and interdependently (please refer to Building Neuron Modelsfor details). To achieve higher integral accuracy, it is recommended to use brainpy.JointEq to jointly solving interconnected differential equations.

import brainpy as bp

## brainpy.JointEq#

brainpy.JointEq is used to merge individual but interconnected differential equations into a single joint equation. For example, below are the two differential equations of the Izhikevich model:

a, b = 0.02, 0.20
dV = lambda V, t, u, Iext: 0.04 * V * V + 5 * V + 140 - u + Iext
du = lambda u, t, V: a * (b * V - u)

Where updating $$V$$ requires $$u$$ as the input, and updating $$u$$ requires $$V$$ as the input. The joint equation can be defined as:

joint_eq = bp.JointEq(dV, du)

brainpy.JointEq receives only one argument named eqs, which can be a list or tuple containing multiple differential equations. Then it can be packed into a numarical integrator that solves the equation with a specified method, just as what can be done to any individual differential equation.

itg = bp.odeint(joint_eq, method='rk2')

There are several requirements for defining a joint equation:

1. Every individual differential equation should follow the format of defining a ODE or SDE funtion in BrainPy. For example, the arguments before t denote the dynamical variables and arguments after t denote the parameters.

2. The same variable in different equations should have the same name. Different variables should named differently.

Note that brainpy.JointEq supports make nested JointEq, which means the instance of JointEq can be an element to compose a new JointEq.

## Why use brainpy.JointEq?#

Users may be confused with the function of brainpy.JointEq, because multiple differential equations can be written in a single function:

def diff(V, u, t, Iext):
dV = 0.04 * V * V + 5 * V + 140 - u + Iext
du = a * (b * V - u)
return dV, du

itg_V_u = bp.odeint(diff, method='rk2')

or simply packed into interators separately:

int_V = bp.odeint(dV, method='rk2')
int_u = bp.odeint(du, method='rk2')

To illusrate the difference between joint and separate differential equations, let’s dive into the differential codes of these two types of equations.

If we make numerical solver for each derivative function, they will be solved independently:

import brainpy as bp
bp.odeint(dV, method='rk2', show_code=True)

def brainpy_itg_of_ode6(V, t, u, Iext, dt=0.1):
dV_k1 = f(V, t, u, Iext)
k2_V_arg = V + dt * dV_k1 * 0.6666666666666666
k2_t_arg = t + dt * 0.6666666666666666
dV_k2 = f(k2_V_arg, k2_t_arg, u, Iext)
V_new = V + dV_k1 * dt * 0.25 + dV_k2 * dt * 0.75
return V_new

{'f': <function <lambda> at 0x0000022948DD6A60>}

<brainpy.integrators.ode.explicit_rk.RK2 at 0x229660543a0>

As is shown in the output code, the variable $$V$$ is integrated twice by the RK2 method. For the second differential value dV_k2, the updated value of $$V$$ (k2_V_arg) and original $$u$$ are used to calculate the differential value. This will generate a tiny error, since the values of $$V$$ and $$u$$ are taken at different times.

To eliminate this error, the differential equation of $$V$$ and $$u$$ should be solved jointly through brainpy.JointEq:

eq = bp.JointEq(eqs=(dV, du))
bp.odeint(eq, method='rk2', show_code=True)

def brainpy_itg_of_ode12_joint_eq(V, u, t, Iext, dt=0.1):
dV_k1, du_k1 = f(V, u, t, Iext)
k2_V_arg = V + dt * dV_k1 * 0.6666666666666666
k2_u_arg = u + dt * du_k1 * 0.6666666666666666
k2_t_arg = t + dt * 0.6666666666666666
dV_k2, du_k2 = f(k2_V_arg, k2_u_arg, k2_t_arg, Iext)
V_new = V + dV_k1 * dt * 0.25 + dV_k2 * dt * 0.75
u_new = u + du_k1 * dt * 0.25 + du_k2 * dt * 0.75
return V_new, u_new

{'f': <brainpy.integrators.joint_eq.JointEq object at 0x0000022967EC0C40>}

<brainpy.integrators.ode.explicit_rk.RK2 at 0x22967ec0160>

It is shown in this output code that second differential values of $$v$$ and $$u$$ are calculated by using the updated values (k2_V_arg and k2_u_arg) at the same time. This will result in a more accurate integral.

The figure below compares the simulation results of the Izhikevich model using joint and separate differential equations ($$dt = 0.2 ms$$). It is shown that as the simulation time increases, the integral error becomes greater.


text:
Beta
×

### Thank you!

Before you choose to head back to the Classic look of the site, we'd appreciate it if you share your thoughts on the Beta; your feedback is what drives our ongoing development.

Beta is different and we value you taking the time to try it out. Please take a look at the changes we've made in Beta and  learn more about it. Thanks for reading, and for making the site better!

# Silk Road's Ross Ulbricht's Next Court Date Set For November

#### timothy posted about 7 months ago | from the your-honor-it-was-an-honor-killing dept.

77

Daniel_Stuckey writes "Ross Ulbricht, the alleged administrator behind the illegal online drug marketplace the Silk Road, will get his day in court on November 3rd, according to a blueprint laid out today in New York's Southern District Court by Judge Katherine Forrest. Ulbrict, alleged by the government to be Silk Road founder Dread Pirate Roberts, is facing four charges (PDF via Wired) related to narcotics conspiracy, running a criminal enterprise, conspiracy to commit computer hacking, and money laundering (other charges have been brought against him regarding murder for hire in Maryland). Appearing today in court—clean-shaven, in a navy blue prison uniform—he pleaded "not guilty" to all charges. Next week, on February 13th, Josh Dratel, Ulbricht's defense attorney, will be handing over hard drives sufficient to hold eight to 10 terabytes of data, which is the approximate size of the evidence which the government has said it may use against Ulbricht. By Feb. 27, two weeks later, the prosecution must return the drives with Silk Road data the FBI collected from computers in a foreign and unnamed country, as well as a drive that holds the contents of the defendant's laptop, which was seized during his dramatic arrest at a San Francisco library in October."

cancel ×

### Beta comment from an old-timer (5, Insightful)

#### The Qube (749) | about 7 months ago | (#46192881)

Obviously, I've been around the Internet and around here for a long time: started reading Chips & Dips and continued reading on a daily basis since then (overall, I don't think I missed a single story ever). I even (unknowingly) helped Rob with a Perl problem on comp.lang.perl when he was coding the original Slashdot (received a "Don't Fear the Penguins" T-Shirt when they made it into the big league - I still treasure it).

A couple of years ago, I switched to doing most of my reading on smartphones and tablets. One of the first apps I downloaded for my iPhone was the Slashdot app (I think it was branded by the then owners and included other sister sites) - it sucked though.

I've tried to support Slashdot whichever way I could. I clicked on ads on Slashdot when I wanted to buy something from those regular advertisers (Rackspace, ThinkGeek etc). I didn't even find Slashvertisments annoying as a lot of those introduced me to products and companies that I didn't know about - a good example was a video for Scottevest hoodies [slashdot.org] , which I've been buying regularly since.

I read some rumblings about Beta in the comments recently and didn't fail to notice :-) a torrent of them over the past week or two, so I decided to check out the Beta site.

The beta site is fundamentally broken! I appreciate where the defensive story yesterday [slashdot.org] came from and I know that a lot of actual technical bugs with the new site can and will be fixed. The problem though is that the idea behind the new site itself is broken, so whatever is being built is being built on wrong foundations (and feel free to replace "foundations" with "intentions", depending on your level of paranoia about Dice's ownership/plans). The commenting functionality very much feels like an add-on (and it is reflected in the UI design as well) - at which point you may as well just run a Wordpress blog with comments or a commercial web discussion plug-in. The commenting functionality needs to be the foundation that the rest of the Slashdot is built on, not the other way around.

Based on my own experience, I know how these things go and I know that these (and others') comments will be ignored because a lot of effort would have gone into the current Beta site already. Something reasonably functional will eventually emerge, after many iterations and after a lot of effort, but by that time, a lot of users will have been needlessly turned away.

Death by a thousand cuts is sad :-(

### Re:Beta comment from an old-timer (1, Insightful)

#### j-stroy (640921) | about 7 months ago | (#46192905)

Respect. Nailed it:
>The problem though is that the idea behind the new site itself is broken, so whatever is being built is being built on wrong foundations

### Re:Beta comment from an old-timer (3, Insightful)

#### DaTrueDave (992134) | about 7 months ago | (#46192909)

Wonder if an editor will reply to a three digit UID?

The solution is simple. Dump the beta and tell everyone that any proposed changes will come from the community (NOT "the audience").

### Re:Beta comment from an old-timer (1)

#### Jack Griffin (3459907) | about 7 months ago | (#46193479)

Fuck this, I've had enough. It's clear the Slashdot has suffered massive and irreparable damage. Can someone give a list of similar sites, I'm ready to walk.

### Re: Beta comment from an old-timer (1)

#### Anonymous Coward | about 7 months ago | (#46193581)

Icanhazcheezburger looks just like beta.
Oh you meant similar to classic.
Nope, there are none.

### Re:Beta comment from an old-timer (1)

#### tqk (413719) | about 7 months ago | (#46199017)

I haven't heard a word about 4chan lately, so maybe it's become interesting and enlightening or something.

### Re:Beta comment from an old-timer (1)

#### dmbasso (1052166) | about 7 months ago | (#46192953)

If I had mod points I would mod you up.

### Re:Beta comment from an old-timer (0)

#### Anonymous Coward | about 7 months ago | (#46192979)

Amen, Brother...amen. Now if only someone up in Dice would only read this and the near 2000 post to the article you linked (also at the header on this page), maybe there will be some kind of reassessment of what they want to do.

Captain Normal

### Re:Beta comment from an old-timer (4, Interesting)

#### Anonymous Coward | about 7 months ago | (#46192989)

Dice is lying through their teeth to the advertisers they hope to attract to Slashdot:
Take the tour [slashdotmedia.com] and you'll see how they claim the nerds will stick around and read their ads. They call Beta "newsier" and "nerdier", although they're well aware the nerd "audience" they're selling won't tolerate Beta.
Advertisers, don't get ripped off! Demand an advertising platform that retains the demographic you want to target!

### Re:Beta comment from an old-timer (0)

#### Anonymous Coward | about 7 months ago | (#46193023)

Advetisier! Tech folks LOVE ads and week old news, our MBAs told us so.

### Re:Beta comment from an old-timer (1)

#### phantomfive (622387) | about 7 months ago | (#46193271)

Well, I do like the advertising. One of the advantages of Slashdot for me is that I'm able to see what companies are trying to sell to developers. In that way it's like going to a trade show for IT/Developers. Right now I can see that IBM is really excited about their new storage appliances for data, for example.

### Re:Beta comment from an old-timer (0)

#### Anonymous Coward | about 7 months ago | (#46193533)

Well, I do like the advertising. One of the advantages of Slashdot for me is that I'm able to see what companies are trying to sell to developers. In that way it's like going to a trade show for IT/Developers. Right now I can see that IBM is really excited about their new storage appliances for data, for example.

News Flash! IBM is in the storage appliances game! Speaking of old news...

Excited?! Humanized. IBM's advertising budget for storage appliances included Slashdot.

### Re:Beta comment from an old-timer (1)

#### wjwlsn (94460) | about 7 months ago | (#46195467)

Interesting. I cruised around the site a little and found this bit about the "psychology" of social engagement. Maybe somebody at Slashdot is using this to try to understand us... so they can design Beta to be more "engaging". If so, I think they've got us figured all wrong.

http://slashdotmedia.com/under... [slashdotmedia.com]

Here's the little comment I left there. (It's still pending... it'll be interesting to see if they actually post it.)

It's interesting that this includes Slashdot... mostly because any conclusions you might draw from it will be horribly wrong if you're trying to understand the Slashdot community. I think I see now where some of the design imperatives driving the Beta site are coming from, and unfortunately, they might end up driving away all the people that actually create the content.

### Re:Beta comment from an old-timer (0)

#### Anonymous Coward | about 7 months ago | (#46193001)

"Death by a thousand cuts is sad :-("

Yes. The good times are gone.

Pick up your box full of tears and man up, move on.

### Re:Beta comment from an old-timer (1)

#### rossdee (243626) | about 7 months ago | (#46193019)

I have been a reader of slashdot, and reqular commenter for quite a while too. Back then I was online for IRC a lot, tp keep in touch with my girlfriend who was 8000 miles away. (we have been married for 11.5 years now.)
At the moment I am on medical leave, due to go back to work on the 21th Feb, so I tend to be online more than usual. I don't read slashdot at work, that would be against company policy. (Besides which I don't have time,) I just use my phone to play music.
For those of you that doubt my geek credentials, I have owned computers of one type or another since July 1979
And in 1974-75 in high school I was writing programs in Fortran, punching holes in the cards with a paperclip, and mailing them to the university computer centre (100 miles away) and getting the printout back a few days later. (This was in NZ, I didn't movr to the US until 2002)

Now get off my (snow covered) lawn

I will miss this place...

### You're now repeating scripture. (0, Troll)

#### rmdingler (1955220) | about 7 months ago | (#46193059)

Old age, time in grade, and time in rank is a mythical way to determine competence.

I reject this doomsayer readiing of the fate of /.

You are repeaters of the Doom mantra. I am tired of the whining complaints.

Do something, and try your best not to resemble the American electorate....whimpering instead of improving and complaining instead of working for effective change.

I am pretty sure i nailed that landing but i have a bit of charmatic reserve in case i am mistaken!

### Re:You're now repeating scripture. (2)

#### Luke has no name (1423139) | about 7 months ago | (#46193205)

Old age, time in grade, and time in rank is a mythical way to determine competence.

They are one of many ways to gauge experience. In any case, people are doing something:

http://altslashdot.org/ [altslashdot.org]

### Re:You're now repeating scripture. (0)

#### Anonymous Coward | about 7 months ago | (#46196425)

Old age, time in grade, and time in rank is a mythical way to determine competence.

Tell that to the next gray haired airline captain on the airliner you fly, you pathetic little knowitall cunt.

Fuck you.

### Re:Beta comment from an old-timer (0)

#### Anonymous Coward | about 7 months ago | (#46193099)

Simply thank you.

### Explain why comments are broken (1)

#### jomama717 (779243) | about 7 months ago | (#46193597)

First off I appreciate your comments, wonderful to see a thoughtful and measured response to this whole thing for a change. I've been using the new site for the past few days - at first just trying to sift through the crap, and then getting fed up and downmodding and finally replying to it out of desperation, and through all of it I never witnessed how the commenting/modding system is any more broken that it has ever been. Missing features galore, yes, but fundamentally broken?

The *only* specific gripe I've seen was that if the thread gets too nested the comments are squeezed into an unreadably narrow box. (1) that's seems like a pretty easy fix, and (2) I can't recall the last time I've read through a good comment thread that was more than 4-5 levels deep. So with respect, what am I missing? What has been fundamentally broken in the comment system? Nobody seems to say, they just say it sucks, or is fundamentally broken, or as you say is an add-on, etc.

I've been an active reader/commenter/submitter for over a decade and none of this makes any sense to me. Worst case the site is done, due not to the redesign itself, but the completely unhinged overreaction to it (see: throwing out the baby with the bathwater [wikipedia.org] .) Best case, 1-2 months from now the is cruising along fine minus a tiny group of users with a very skewed set of priorities.

### Re:Explain why comments are broken (3, Informative)

#### deconfliction (3458895) | about 7 months ago | (#46193879)

What has been fundamentally broken in the comment system? Nobody seems to say, they just say it sucks, or is fundamentally broken, or as you say is an add-on, etc.

I'm not the GP, but I'll answer with the 2 most critical points for me personally.

1) the fresh user experience involves by default full expansion of 0 and -1 comments. This is pure poison. Much as I laud the side of the debate that paints us commenters as *contributors* rather than just 'audience', the fact is that there are as many poisonous comments as golden ones. Exposing new users to the site to all of those instead of hiding score:0/-1 by default and 1-lining score:1/2 will simply leave new visitors with the wrong impression of the site (IMHO)

2) for me, the ability to direct link to comments is critical. This seems missing, and as yet I've seen no promise to implement it in beta or keep its aspect of classic around permanently. For instance, I like to share specific comment subthreads, like this one, between myself and active duty US Navy Information Warfare Officer Dave Schroeder from 8 months prior to the Snowden revelations-

snippets of context include-

"
That's one problem with cyber (Score:5, Insightful)

Disclaimer: I am a Navy Information Warfare Officer.

First, it's important to note that the White House didn't confirm the suspected source. It was anonymous officials who said this appeared to originate "from China" -- take that as you will.
" ...

"
A couple of things:

1. I thought your Google manifesto was very good (I know it's a work in progress).
2. I think you're reading WAY too much into certain things. ... ... ...

Back to the other issues. I'm a little disappointed you called so many of my responses straw men; they're not in any respect.

I have not seen any serious calls for "backdoors" in secure protocols. You're completely misunderstanding what even the FBI wants: you're imagining a scenario where "the Man" has a secret backdoor to any running system, encryption, or secure protocol, anywhere. That is not only false, it actually would be gravely detrimental to our own security: we -- individuals, the civilian sector, the government, the military -- rely on the security of these protocols. It's similar to the belief among some that NSA has a "secret backdoor" ...
"

### Re:Explain why comments are broken (0)

#### Anonymous Coward | about 7 months ago | (#46206805)

Disclaimer: I am a Navy Information Warfare Officer.

Holy shit! And to think once I tried to troll Dave by calling him a jackbooted thug, he IS a jackbooted government thug!

### Re:Explain why comments are broken (1)

#### Immerman (2627577) | about 7 months ago | (#46207821)

Also the extremely wide sidebars. How are you supposed to hold a decent conversation when you can only fit a handful of words per line? Your post for example would easily fill a half-dozen pages worth of text..

### Re:Explain why comments are broken (1)

#### M. Baranczak (726671) | about 7 months ago | (#46195769)

The missing features wouldn't be a big deal if this was an early preview, but they were actually planning to take this thing live.

And if the wide margins are such an easy fix, then why haven't they fixed it? People have been complaining about this since the beta came out 5 months ago. And I don't mean just posting random comments about how it sucks - a lot of us actually took the time to give specific feedback, but this feedback was completely ignored.

### Re:Beta comment from an old-timer (1)

#### unitron (5733) | about 7 months ago | (#46194093)

I applaud your comment and would greatly appreciate your consideration of this

http://slashdot.org/submission... [slashdot.org]

along with an upvote out of Firehose purgatory if quite convenient.

### Re:Beta comment from an old-timer (2)

#### aliquis (678370) | about 7 months ago | (#46194673)

Seriously.

They run Slashdot.

Yet they still haven't figured out we don't even read the summaries.

### Re:Beta comment from an old-timer (0)

#### Anonymous Coward | about 7 months ago | (#46195369)

Jesus fucking christ. Can you old guys stop bitching about the new beta!? I've been reading slashdot for years and I don't mind trying something new.

Now I get that you old guys have problems with new stuff, but stop spamming *every* *single* *story*.

### Re:Beta comment from an old-timer (1)

#### Janek Kozicki (722688) | about 7 months ago | (#46198855)

This guy wants to start altSlashdot: http://slashdot.org/~Okian%20W... [slashdot.org] - check his latest comments

I hope it will have UTF-8 support as well as mathjax - the math rendering engine used on stackexchange [stackoverflow.com] . Imagine how wonderful comments and posts could look like, if people could embed formulas easily!

Our wiki now collects all the most important ideas: http://www.altslashdot.org/wik... [altslashdot.org]

Also you are welcome on IRC ##altslashdot on freenode

BTW, I haven't changed my sig since 2002, and it will be the same on new slashdot, whatever name we pick: http://www.altslashdot.org/wik... [altslashdot.org]

### slashdot betas next court date... right now! (1)

#### Anonymous Coward | about 7 months ago | (#46192891)

verdict: GUILTY OF SUCKING

### beta comment from a not-so-old-timer (5, Interesting)

#### perpetual lurker (3529599) | about 7 months ago | (#46192893)

I've been reading slashdot for around a decade and have never bothered to create an account let alone comment / moderate, but I did today in order to add one more voice to the chorus of lamentations over the design changes.

Since finishing my schooling, slashdot has been the place that I come to continue to learn. Slashdot has taught me a history of the internet from the perspective of the people who actually developed it. Slashdot introduced me to linux which I now run exclusively in my house. And it has influenced my thinking on non-technical subjects like civics and law. I visit daily because, despite all the flamewars and occasional shill, uniquely knowledgeable people always have some insights to share.

Since this site is now facing an identity crisis that threatens to drive away the community that makes it worthwhile I want to share one tidbit that I learned here:

grok: (verb) to understand so thoroughly that the observer becomes a part of the observed—to merge, blend, intermarry, lose identity in group experience

I have grokked slashdot. The people pushing the awful beta design clearly have not.

### Re:beta comment from a not-so-old-timer (1)

#### rmdingler (1955220) | about 7 months ago | (#46193127)

If /. were a familiar lover instead of my substitute for one (heh heh),

I would have sex with her on the back of an angry bear.

I will not stand idly by and watch her self-induced destruction without intervening.

I will love her even if she's Dice's whore.

### Who cares? (-1)

#### Anonymous Coward | about 7 months ago | (#46192897)

Someone did something illegal and will go to jail for it.

Meanwhile...

People are being murdered, and children are being abducted. But since this is some "anonymous" type person, we have to read tons of press about it.

Lock him up and throw away the key. You Ulbrict-leg humpers can write him letters.

### Re:Who cares? (0)

#### Anonymous Coward | about 7 months ago | (#46193093)

Right. And Fuck Beta!

### Re:Who cares? (3, Funny)

#### unitron (5733) | about 7 months ago | (#46194113)

These on-topic posts are so confusing just now.

### paste this to cut the BETA (4, Informative)

#### melikamp (631205) | about 7 months ago | (#46192899)

Please post this to new articles if it hasn't been posted yet. (Copy-paste the html from here [pastebin.com] so links don't get mangled!)

On February 5, 2014, Slashdot announced through a javascript popup that they are starting to "move in to" the new Slashdot Beta design. Slashdot Beta is a trend-following attempt to give Slashdot a fresh look, an approach that has led to less space for text and an abandonment of the traditional Slashdot look. Much worse than that, Slashdot Beta fundamentally breaks the classic Slashdot discussion and moderation system.

We should boycott stories and only discuss the abomination that is Slashdot Beta until Dice abandons the project.
We should boycott slashdot entirely during the week of Feb 10 to Feb 17 as part of the wider slashcott [slashdot.org]

Moderators - only spend mod points on comments that discuss Beta
Commentors - only discuss Beta
http://slashdot.org/recent [slashdot.org] - Vote up the Fuck Beta stories

Keep this up for a few days and we may finally get the PHBs attention.

Discussion of Beta: http://slashdot.org/firehose.pl?op=view&id=56395415 [slashdot.org]
Discussion of where to go if Beta goes live: http://slashdot.org/firehose.pl?op=view&type=submission&id=3321441 [slashdot.org]
Alternative Slashdot: http://altslashdot.org [altslashdot.org] (thanks Okian Warrior (537106) [slashdot.org] )

### Re:paste this to cut the BETA (1)

#### Xacid (560407) | about 7 months ago | (#46195021)

"Keep this up for a few days and we may finally get the PHBs attention." ...we already got their attention. Why is everyone still beating the dead horse after our concerned have been acknowledged. I'm fairly certain the point has been made - and clearly. Now it's the people doing all the "fuckbeta" nonsense continuously that's pushing me away from this site - not beta itself.

### wtcinp...fb (0)

#### Anonymous Coward | about 7 months ago | (#46192913)

While this certainly isn't productive...

fuck beta

### Mourning Slashdot ;( (2, Insightful)

#### zidium (2550286) | about 7 months ago | (#46192917)

I have been an active and paying member of Slashdot for the better part of 15 years. I am already mourning its demise, as I view it is on its deathbed in terminal condition.

Please, please don't make the beta live for everyone, even if there is a (let's face it) temporary classic mode ;(

This reminds me too much of FastMail's UI disaster of October 31st 2012 :(

### Re:Mourning Slashdot ;( (0)

#### Anonymous Coward | about 7 months ago | (#46193365)

> paying member of Slashdot

What? I've never heard of such a thing, and I think I've read at least the subject of every story posted here since Oct 1998 when I met the /. guys at the Atlanta Linux Showcase. Got a link to any info on the paying part?

### Re:Mourning Slashdot ;( (1)

#### glavenoid (636808) | about 7 months ago | (#46194165)

The old page to purchase subscriptions [slashdot.org] and the FAQ [slashdot.org] which explains the subscription program.

I've never heard of such a thing, and I think I've read at least the subject of every story posted here since Oct 1998 when I met the /. guys at the Atlanta Linux Showcase.

You should take a remedial reading course if you missed this. It's been mentioned many, many times over the years. Or maybe get yourself checked for senility.

### Re:Mourning Slashdot ;( (0)

#### Anonymous Coward | about 7 months ago | (#46206103)

That displays a login page. There is no mention of a subscription. You got caught in a lie.

### DON'T BE FOOLED INTO DISCUSSIONS HERE! (0)

#### Anonymous Coward | about 7 months ago | (#46192921)

Remember BETA will be MANDATORY SOON!

I've heard of companies hiring people or volunteers to participate in discussions, especially on new or dwindling boards to bring more traffic - not saying any company in particular here, but the reality of such actions occur - some admins on some forums have admitted in the past of people pretending to be more than 1 person in a conversation to increase hits.

Stay the course - if they switch to Beta without classic mode, then never visit this site again.

If you want nostalgia, try Archive.org's The Wayback Machine. It might be a good idea to download content you want now before it disappears, sometimes even archive.org can't or won't archive everything.

A captain may go down with his beta ship, but that doesn't mean we have to cling to it because we spent X years here.

THE WAY IS SHUT

### I am getting a feeling... (0)

#### Anonymous Coward | about 7 months ago | (#46192947)

that people around here don't like the new beta site? Or am I way off?

### I see BETA people ... (0)

#### Anonymous Coward | about 7 months ago | (#46192971)

they don't even know they're BETA.

They prostrate themselves before their master's table and beg/whine for scraps, even if it's only for a short time.

I swear, if you guys who are begging and staying for the beta are all Americans, it wouldn't surprise me. You have the attention span of a gnat and can't stick to anything. Everything is short lived or given the smallest degree of effort before quitting.

If you want to stick to something, stick to the fact that BETA is here and CLASSIC will be GONE.

Friends don't let friends go BETA.

This is your brain on BETA, and so forth.

### Beta violates ADA guidelines (5, Insightful)

#### Antique Geekmeister (740220) | about 7 months ago | (#46193005)

The unnecessarily complex and excessively indented layout interferes with text->speech tools, and actually reduces legibility for people who heavily expand their screens due to visual problems. The current clean, well ordered, linear layout is easy to use, intuitive, and doesn't insert painful, confusing, or unnecessary complexity. The slashdot readers, and contributors, are here for the stories, not for the exciting newness of the GUI.

Does anyone know who actually _wrote_, or demanded, the Slashddot Beta? I'd like their names so we can warn our clients and colleagues _against_ their work.

### Re:Beta violates ADA guidelines (0)

#### Anonymous Coward | about 7 months ago | (#46193069)

Assistant District Attorney of what state?

Or is this something to do with the ADA language (named after Countess Ada Lovelace, who programmed Babbages mechanical computer)

### Re:Beta violates ADA guidelines (0)

#### Anonymous Coward | about 7 months ago | (#46193135)

In case you actually are as fucking stupid as you appear to be, he's talking about the Americans with Disabilities Act of 1990 [wikipedia.org] .

Those of us working on important web sites takes accessibility extremely seriously.

What the GP is saying is vitally important. We should know exactly who is behind the failed Slashdot redesign. Their work is clearly sub-par, and as an industry we need to protect ourselves from their apparent incompetence. The best way to do this is to know who they are, and then to avoid engaging in any sort of a design or business relationship with them in the future.

### Re:Beta violates ADA guidelines (0)

#### Anonymous Coward | about 7 months ago | (#46193273)

"In case you actually are as fucking stupid as you appear to be, he's talking about the Americans with Disabilities Act of 1990"

I am not from the USA.
I know about the position of "Assistant District Attorney" from the Law & Order series which was shown on TV in my country.
I used to go down Ada St on my way to work.

I don't know the names and acronyms of all the American legislation. I know you have a PATRIOT act which is not named after a movie starring Mel Gibson and Peter Woodward, nor is it named after the SAM that was fired against SCUDs during the gulf war. Just some concocted acronym.

### Re:Beta violates ADA guidelines (1)

#### dcollins (135727) | about 7 months ago | (#46193139)

Americans with Disabilities Act.

### Re:Beta violates ADA guidelines (1)

#### Antique Geekmeister (740220) | about 7 months ago | (#46195115)

I never mentioned the ADA in my post. So you obviously know that the relevant law is the American with Disabilities Act, since you inferred its mention without my having written it.

May I assume that such a mis-aimed, ill-founded troll was written by someone whose paycheck relies on the slashdot beta? The presence of irrelevant and distracting matierial based on a need that was invented out of misunderstood references and now leads to confused publication by someone who has failed to address any genuinely relevant issue does sound like the Slashdot Beta.

### Re:Beta violates ADA guidelines (0)

#### Anonymous Coward | about 7 months ago | (#46193119)

Does anyone know who actually _wrote_, or demanded, the Slashddot Beta? I'd like their names so we can warn our clients and colleagues _against_ their work.

Rumor has it, that it was Satan!

### Re:Beta violates ADA guidelines (1)

#### zidium (2550286) | about 7 months ago | (#46193189)

Nah, I don't think Stallman had anything to do with this ;-)

### Re:Beta violates ADA guidelines (2)

#### zidium (2550286) | about 7 months ago | (#46193195)

I think I may have been banned... My last comment had a blank subject and a single "?" in the comment box.

Nah, I don't think Stallman had anything to do with it ;-)

### Re:Beta violates ADA guidelines (0)

#### Anonymous Coward | about 7 months ago | (#46193327)

I think I may have been banned... My last comment had a blank subject and a single "?" in the comment box.

Nah, I don't think Stallman had anything to do with it ;-)

You know what? It was probably the work of SATAN!

### Re:Beta violates ADA guidelines (1)

#### Antique Geekmeister (740220) | about 7 months ago | (#46195145)

Perhaps it was "SANTA" ?

http://www.porcupine.org/satan... [porcupine.org]

I still remember the SATAN network scanning tool, which had a little script called "repent" to change the name and gifs to "SANTA"

Could there possibly be such a tool in place to "repent" the Slashdot Beta to something usable? We can only hope.

### Re:Beta violates ADA guidelines (0)

#### Anonymous Coward | about 7 months ago | (#46193137)

Those are user focused guidlines. Dicenut fags don't care about those.

What they care about is - What catches eyeballs... what makes them click the add. It's not about empathetic UI UX

It's about metric based testing and whatever the fuck whores out the UI UX for maximum revenue. To your face they say they care but really they or analyzing every single measurable metric for what creates the most clicks. Sites gotta pay bills and employees but it's a balance. Malda got the balance... honored the tethership.

Malda why the fuck did you let the reigns to these assholes.

### Re:Beta violates ADA guidelines (0)

#### Anonymous Coward | about 7 months ago | (#46193443)

You did not know who wrote the new beta? That was the same team that worked on windows 8 OK now I will have some beer :)

### Re:Beta violates ADA guidelines (0)

#### Anonymous Coward | about 7 months ago | (#46194565)

Does anyone know who actually _wrote_, or demanded, the Slashddot Beta? I'd like their names so we can warn our clients and colleagues _against_ their work.

This is an excellent initiative. The festering pile of shit that is Slashdot Beta should be prevented in any way possible from seeing the light of day, and this is one of the better weapons in our arsenal to achieve that goal.

### Never Surrender (0)

#### Anonymous Coward | about 7 months ago | (#46193045)

some people are drumming up support for the editors or others behind the FORCED BETA move.

DO NOT LET THEM TIRE YOU.
Do not let them win you over from emotions.

No shit like, "C'mon guys, I really enjoy this site, let's stop posting crap" because THEY just don't get it, or they do and want to stop OUR RIGHT to PROTEST and SWALLOW the Beta shit and to hell with us the users!

Please continue to MOD UP Anti-Beta posts, THIS IS OUR RIGHT!

Remember where this is headed, remember where DIGG has gone.

When the BETA is rolled out, no matter how difficult it may be, STOP coming.

R.I.P. Slashdot, DIGG, Kuro5hin

### A PILL FOR EVERY ILL (0)

#### Anonymous Coward | about 7 months ago | (#46193105)

For Slashbeta? Cyanide

### and now for a comment not related to beta... (0)

#### Anonymous Coward | about 7 months ago | (#46193201)

What happened to a fair and speedy trial? It's February. Why in the holy fucking hell does he have to wait until November?

### Re:and now for a comment not related to beta... (0)

#### Anonymous Coward | about 7 months ago | (#46193241)

A secret court decided that it would be best.

### Social Media for B2B Technology (0)

#### Anonymous Coward | about 7 months ago | (#46193321)

Slashdot (/.) is an online community that features technology-centric news and discussion. The site has been pioneering user-generated content and social media since 1997. Slashdot consists of a mix of reader-submitted news, opinion, interviews and crowd-sourced questions, backed by professional insight and analysis. In addition to user-generated content, the site features original editorial covering a variety of IT topics including cloud computing, data centers, storage, mobility and business intelligence. Knowledgeable and tech savvy users (in all corners of the tech world) share and create a broad range of stories, and leave thousands of comments, every day. Slashdot is “News for Nerds. Stuff that Matters.”

#### Anonymous Coward | about 7 months ago | (#46193351)

WTF is going on with /.? Normally after two hours there'd be dozens of comments to even an uninteresting post. Did people just give-up on the site?

### I am fed up (0)

#### Anonymous Coward | about 7 months ago | (#46194779)

I agree, it is non-stop "beta sucks" comment flow. It has become useless.
Does anyone still sane have a suggestion which subreddits to subscribe to for a slashdot like story feed?

### OK fuck beta but... (0)

#### Anonymous Coward | about 7 months ago | (#46193397)

The legibility of what text is actually on the screen is loads better than the classic site. One half of people bitch and moan about spacing and layout on beta being absurd but fuck that. I loaded up classic and was immediately greeted with stories taking up half the width of my screen. Double tap to expand and now text from left to right is edged with the kerning on classic making it harder to read as the First and last letters look like they bleed out of the blackness of my display.

Time to expand those comments I'm interested in, but wait, it's so fucking small it expanded the wrong one and jumped to an illogical place in the document body. Fuck classic on mobile. This is exactly why I'd lurk from RSS on mobile.

The other half are bitching, rightfully so, because comments on beta damn near feel like one is reading WordPress comments. Its fucked.

And it doesn't fucking matter BC the people who really shape this community are exiting. I'm not one of those ppl, I lurk here to be shaped by the community that's seemingly dissolving.

And for the love of sanity, stop promoting shit like altslashdot where the first page you see has a "business" plan and potentential monetization scheme. If there's going to be an alternate, think big, no bigger, NO FUCKING BIGGER SHIT-FOR-BRAINS and design something distributed yet accessible (don't fucking reply to me about Usenet or some shit, reread the caps) and keep the corporate bullshit fenced out. Make monetization an impossibility and that will necessitate a self sufficient system where the community can't get fucked in the rear.

Fuck beta? No, fuck DICE for spreading the gems of people that found there way here that have shaped my views and and disillusioned my ignorance on subjects I normally gloss over across the entirety of the internet.

### fuck the beta: fonts edition (0)

#### Anonymous Coward | about 7 months ago | (#46193419)

can someone explain to me what is the sense of the different fonts in the beta? Some people's posts are classic helvetica some people have some kind of funky ass times new roman and i'm pretty sure some people had whole posts in italics. What the fuck are these different fonts supposed to mean? I have no fucking idea! Or are they just totally random shit meant to make slashdot annoying to read? Well, mission fucking accomplished then. But really is there legitimately some purpose to the different fonts or what? I don't get it.

### Re:fuck the beta: fonts edition (1)

#### glavenoid (636808) | about 7 months ago | (#46194211)

My best guess is they're different accents based on your posting location. Helvetica is standard American English, Times New Roman is standard RP British English. At least that's how they sound to my eyes.

The italics are just drunk.

### Re: Silk Road's Ross Ulbricht's Next Court Date Se (0)

#### Anonymous Coward | about 7 months ago | (#46193427)

I'm guiessing that this means nobody gives a flying fuck about ol' Ross.

Move on, nothinig to see here.

### rtfa (1)

#### melchoir55 (218842) | about 7 months ago | (#46193463)

I didn't rtfa becase....

beta sucks. Clueless MBAs in tech companies suck. Clueless marketing and sales drones in tech companies suck.

Get a clue.

Boycott /. from the 10th to the 17th

### FORK SLASHDOT (0)

#### Anonymous Coward | about 7 months ago | (#46193493)

It's not about whether the beta interface sucks or not (though it does). What it's about is this:

"But, yes, we're trying something new. Why? We want to take our current content and all the stuff that matters to this community and deliver it on a site that still speaks to the interests and habits of our current audience, but that is, at the same time, more accessible and shareable by a wider audience. We want to give our current audience the space where they are comfortable."

The "audience" needs to expand to increase revenue. Interests, habits, wider, audience. That's all it is. Dice couldn't give a shit who the "audience" is, as long as there's more eyeballs. Fork /.

### Wow this looks terrible! (0)

#### Anonymous Coward | about 7 months ago | (#46193539)

What happened to the interface? This BETA view is just awful!!! I can't see the comments, I have to click at the bottom? ugh, well I really hope someone makes an alternative to slashdot before this beta thing goes live. This is just dreadful.

If you are listenting, then how did I get redirected to this stupid interface?

### WHY so LATE? (0)

#### Anonymous Coward | about 7 months ago | (#46194937)

It's only February. Do they plan to use Manning-style incarceration to 'soften him up?"

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text:
A Green's Function ODE BVP

1. Jan 3, 2018

Krikri

I have this BVP $$u''+u' =f(x)-\lambda |u(x)|$$, $x\in [0,1]$ we BC $u(0)=u(1)=0$.
Following an ''algorithm'' for calculating the green's function I got something like $$g(x,t)=\Theta(x-t)(1+e^{t-x}) + \frac{e^{t}-e}{e-1} +\frac{e-e^{t}}{e-1}e^{-x}$$. At some point there is this integral $j(x)=- \int_{0}^{1}g(x,t)dt$ and since $j(0)=j(1)=0 , j'' + j'=-1$ which leads to $j(x)= \frac{e}{e-1} -x -\frac{e}{e-1}e^{-x}$
Can someone show me how it goes from defining the integral to find this form of $j(x)$. I mean for the conditions I see there is a straight connection with our initial form BC. For the second I understand that the differential operator acts on j(x) but why it gives -1 and how j(x) takes the final form?

2. Jan 8, 2018

PF_Help_Bot

Thanks for the thread! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post? The more details the better.

3. Jan 9, 2018

Delta²

Which function is f(x)? if f(x) is a known function and g(x,t) is the Green's function then the solution is $u(x)=\int\limits_{D(f)} g(x,t)f(t)dt$.

4. Jan 9, 2018

jasonRF

Since the ode has the absolute value term, it isn't linear in general. So I wouldn't expect the solution to be a nice linear combination like the integral of a Green's function. Perhaps if $g$ and $u$ do not change sign at all over the interval it is fine?


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