You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: tutorial30.m
    path of file: ./repos/spinw/tutorials/publish
    
    the code of the file until where you have to start completion: %% Help on SpinW
% Use the help command to get help on any SpinW function. For any function
% that starts with 'sw_' use help swfiles, for spinw class methods use help
% spinw.function_name. For help on plotting commands, use help swplot.

help swfiles

% To find the location of the spinw library use
sw_rootdir

% To open any of the functions in the Matlab editor, use
edit spinw.plot

% To look at any of the spinw object properties, double click on the
% "Workspace" view on the name of the object. Also the data files
% (symmetry.dat, atom.dat, color.dat, magion.dat) can be easily edited, for
% example

edit symmetry.dat

% Some settings are ekpt during the active Matlab session, these can be
% set/get using the swpref.setpref and swpref.getpref commands. To change
% the default values, it can be defined in the startup.m file. To get all
% current value use

swpref

%% Generate lattice
% We create a triangular lattice of magnetic atoms.

tri = spinw;

% The lattice parameters in Angstrom and angles in degree can be defined.
tri.genlattice('lat_const',[3 3 4],'angled',[90 90 120])

% To plot the lattice use the command spinw.plot.
plot(tri)

% In the plot window, you can zoom with the mouse wheel, pan by pressing
% the Ctrl button while dragging. Change the plot range and view direction
% by pressing the corresponding buttons on the top.


%% Adding atoms
% We add 1 atom at the origin of the unit cell, spin-3/2 Cr3+ ion using the
% spinw.addatom.

tri.addatom('r',[0 0 0],'S',3/2,'label','MCr3')

plot(tri)


%% Definition of the spin-Hamiltonian
% We create an antiferromagnetic first neighbor Hamiltonian plus easy plane
% single ion anisotropy red ellipsoids represent the single ion anistropy
% on the plot (equienergetic surface) examine the plot and test different
% values of A0 with different signs. The plot command can plot  rectangular
% cut of t
    
function
% that starts with 'sw_' use help swfiles, for spinw class methods use help
% spinw.function_name. For help on plotting commands, use help swplot.

help swfiles

% To find the location of the spinw library use
sw_rootdir

% To open any of the functions in the Matlab editor, use
edit spinw.plot

% To look at any of the spinw object properties, double click on the
% "Workspace" view on the name of the object. Also the data files
% (symmetry.dat, atom.dat, color.dat, magion.dat) can be easily edited, for
% example

edit symmetry.dat

% Some settings are ekpt during the active Matlab session, these can be
% set/get using the swpref.setpref and swpref.getpref commands. To change
% the default values, it can be defined in the startup.m file. To get all
% current value use

swpref

%% Generate lattice
% We create a triangular lattice of magnetic atoms.

tri = spinw;

% The lattice parameters in Angstrom and angles in degree can be defined.
tri.genlattice('lat_const',[3 3 4],'angled',[90 90 120])

% To plot the lattice use the command spinw.plot.
plot(tri)

% In the plot window, you can zoom with the mouse wheel, pan by pressing
% the Ctrl button while dragging. Change the plot range and view direction
% by pressing the corresponding buttons on the top.


%% Adding atoms
% We add 1 atom at the origin of the unit cell, spin-3/2 Cr3+ ion using the
% spinw.addatom.

tri.addatom('r',[0 0 0],'S',3/2,'label','MCr3')

plot(tri)


%% Definition of the spin-Hamiltonian
% We create an antiferromagnetic first neighbor Hamiltonian plus easy plane
% single ion anisotropy red ellipsoids represent the single ion anistropy
% on the plot (equienergetic surface) examine the plot and test different
% values of A0 with different signs. The plot command can plot  rectangular
% cut of the lattice setting the unit option to xyz and giving the plot
% range in Agnstrom.

A0 = 0.1;

tri.addmatrix('label','J1','value',1)
tri.addmatrix('label','A','value',[0 0 0;0 0 0;0 0 A0])

tri.gencoupling

tri.addcoupling('mat','J1','bond',1)
tri.addaniso('A')

plot(tri,'range',[22 20 1/2],'unit','xyz','cellMode','single')


%% Magnetic structure
% The ground state magnetic structure of the above Hamltonian is a spiral,
% with propagation vector of (1/3,1/3,0). We define the plane of the spiral
% as the ab plane. Careful: the given spin vector is column vector! What
% are the angles between neares neighbor moments?

tri.genmagstr('mode','helical','S',[1;0;0],'k',[1/3 1/3 0],'n',[0 0 1],'nExt',[1 1 1])

plot(tri,'range',[3 3 1/2],'cellMode','inside','magColor','red')


%% Spin wave dispersion
% We calculate the spin wave dispersion along the (H,H,0) high symmetry
% direction. 
% How many spin wave modes are there and why? 
% What does the red line mean?
% Did you got any warning?
%

spec = tri.spinwave({[0 0 0] [1 1 0] 500},'hermit',false);

figure
sw_plotspec(spec,'mode','disp','imag',true,'colormap',[0 0 0],'colorbar',false)
axis([0 1 0 5])

%% Spin-spin correlation functions
% The spin-spin correlations is already calculated, however the result
% contains 9 numbers per Q-point per mode. It is not possible to show this
% on a single plot.
%
% BUT!
%
% 1. we  can calculate the neutron scattering cross section
% 2. we can select one of the components S_alpha_beta(Q,w)
% 3. we can sum up the diagonal S_alpha_alpha(Q,w)
%
% What do you see? Where is the largest intensity? How is it related to the
% magnetic propagation vector?
%
% Why are some modes gapped? What type of spin-spin correlations are gapped? 
%
% Why do we have Szz?
%
% Shouldn't the spins precess around M? Shouldn't each spin wave mode
% corresponds to a precession in a specific plane not a motion along a
% specific axis?
%

%spec = sw_egrid(spec,'component','Sperp','Evect',0:0.01:5.5);
spec = sw_egrid(spec,'component',{'Sxx+Syy' 'Szz'},'Evect',0:0.01:5);
%spec = sw_egrid(spec,'component','Syz','Evect',0:0.01:5);

figure
sw_plotspec(spec,'mode','color','dE',0.2,'imag',false)
hold on
axis([0 1 0 5.5])
caxis([0 3])


%% k=0 magnetic structure
% We can generate the same magnetic structure with zero propagation vector
% on a magnetic supercell.
%
% Why would we do that? Not for a triangular lattice, but in more complex
% cases, we will have to!
%
% You can keep the previous structure plot by pressing the red circle on
% the figure to compare the new magnetic structure. Is there any
% difference?
%
% What are we doing here? Can you tell from the script?
%
% Check out the tri.magstr command? What data is stored there? What are the
% dimensions of the different matrices?
%
% You can also compare the energy per spin of the old magnetic structure
% and the new magnetic structure using the spinw.energy() function. Is
% there any difference?
%
% You can also store the new magnetic structure in a separate SpinW object
% by first duplicating the original object using the copy() command! 
% 
% What happens when we use tri2 = triNew, without the copy command?

triNew = copy(tri);
tri2   = triNew; 

triNew.genmagstr('mode','random','next',[3 3 1])
triNew.optmagsteep('nRun',1e4)
% Converged?

triNew.genmagstr('mode','rotate','n',[0 0 1])

phi1 = atan2(triNew.magstr.S(2,1),triNew.magstr.S(1,1));

triNew.genmagstr('mode','rotate','n',[0 0 1],'phi',-phi1)

plot(triNew,'range',[3 3 1],'atomLegend