Plotting data in 30 second increments within a for loop?

Hello,

I have a set of data which I separated into 10 different subplots, each showing 30 seconds of data up to 300 seconds:

nrow = 5; 
ncol = 2; 
nplots = nrow * ncol; 
sec30 = 0:30:300; 
for i = 1: nplots
    subplot(nrow, ncol, i)
    idx = timex >= sec30(i) & timex <=sec30(i+1);
    plot(timex(idx), signal(idx))  
end

Separately, I generated the Power Spectral Density (PSD) of my data using the pwelch function like so:

Fs=794;                 % samples per unit time, in this case
WINDOW = 1024;          % segment length and Hamming window length for welch's method (use power of 2)
NOVERLAP = 512;         % # signal samples that are common to adjacent segments for welch's method (half the window value)
NFFT = 1024;            % Same # as window

nsignal = size(signal,1);

%run pwelch to figure out output length
[psdecog,freq]=pwelch(signal(1,:),WINDOW,NOVERLAP,NFFT,Fs);

psd_length = length(psdecog);

%initialize psdall
psdall = zeros(psd_length,nsignal);
for i = 1:nsignal
    psdall(:,i) = pwelch(signal(i,:),WINDOW,NOVERLAP,NFFT,Fs);
   
end

and then plotted that:

figure;
nrow = 1; 
ncol = 2; 
nplots = nrow * ncol;
plotNames={'1';'2'}
for i = 1: nplots
    subplot(nrow, ncol, i)
    plot(freq,log(psdall(:,i)));
    title(sprintf('Signal %s', plotNames{i}))
    x_title=sprintf('Frequency',i);
    xlabel(x_title)
    y_title=sprintf('PSD',i);
    ylabel(y_title)
end

What I would like to do now, is generate/plot my PSD data for each of those 30 second incremements - so basically combining the functions of my first and last plots.

Does anyone know how I might go about doing this? Thanks in advanced for any advice and let me know if I need to clarify anything.

[KSSV]

Read about reshape. You can reshape your data with this function.

[Maria Y]

I'll look into it, thank you!