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: evopmtmML.m
    path of file: ./repos/acycle/code/seriesanalysis
    
    the code of the file until where you have to start completion:  function [powratio]=evopmtmML(dat,filename,fmin,fmax,window,fterm,nw)
% Mingsong Li, Nov 12, 2014 @ JHU
% dat should be even spaced time series

%%
datasxdif=diff(dat(:,1));
dt=mean(datasxdif);
    
function [powratio]=evopmtmML(dat,filename,fmin,fmax,window,fterm,nw)
% Mingsong Li, Nov 12, 2014 @ JHU
% dat should be even spaced time series

%%
datasxdif=diff(dat(:,1));
dt=mean(datasxdif);
nyquist=1/(2*dt);                   % nyquist
[nrow ncol]=size(dat);    % size of dat
xdata=dat(:,2);           % value of interpolated series
npts=round(window/dt);              % number of data used for one calculation
m=nrow-npts+1;                      % number of pmtm calculations, n_row of pmtm matrix results
pow=ones(1,m);                      % matrix of sum power from fmin to fmax
powall=ones(1,m);                   % matrix of sum power from 0 to fterm
ratio=zeros(1,m);                   % ratio of selected pow/powall
x=zeros(1,npts);                    % 1*npts matrix for picking data using floating window
[nfpts]=nfft(npts);                 % function nfft is at the end