MATLAB: How to store every output from every iteration of a for loop in an array

for loop

I have a code that extracts some parameters from some data in the following way:
LasingThreshold=0.1;
% %---------Convert xlsx to mat - only need to use once---------------------- 
 files = dir('LIV Data*.xlsx');
 for k = 1:numel(files)
     [num,text,raw] = xlsread(files(k).name);
     [dummy, myName] = fileparts(files(k).name);
     save(myName)
 end
 %--------------------------------------------------------------------------
 
 D = uigetdir
 cd(D);
S = dir(fullfile(D,'LIV Data T= *.mat'));  %   Makes a structure with all files
N = numel(S);   %   Counts number of files
CM = cool(N); % set colormap
fig1 = figure;
Pdissarray = zeros(N,52)
for ii = 1:N, j = 1:52;
    T = load(fullfile(D,S(ii).name));   % Load each file as a structure
    I = T.num(3:end,1); % Extract each parameter from full file and ignore first two data points
    V = T.num(3:end,2);
    P = T.num(3:end,3);
    Pelec = V.*I;
    Pdiss = Pelec-P;
    Pdissarray(ii,j) = Pdissarray(ii,j)+Pdiss(ii)
    DataPoints = length(I);
    k = find(P>LasingThreshold,1);
    fit = polyfit(I(k:round(DataPoints/2)),P(k:round(DataPoints/2)),1); %Need value of P to be greater than the laser threshold - this should be done better eventually
    fitplot = polyval(fit, I);
    slope(ii) = fit(1);
    iTh(ii) = -fit(2)/fit(1);
    subplot(1,2,1);
    plot(I,P,'.','markers',5,'color',CM(ii,:))
    plot(I,fitplot,'-.','color',CM(ii,:))
    ylim([0 4]);
    xlabel('Current (mA)')
    ylabel('Power (mW)')
    hold on
    subplot(1,2,2);
    plot(I,V,'.-','markers',4,'color',CM(ii,:))
    xlabel('Current (mA)')
    ylabel('Voltage (V)')
    hold on
end
I'm having a problem with Pdissarray – I want it to store all of the values of Pdiss for each file. I'm currently trying to put this into a single array but that doesn't have to be the way I do it, I just need to retain the values in some form. Currently it is just taking the final value of Pdiss for each file and repeating it over the array. I have included two files with the code.

Best Answer

The simplest way is to use the indexing to assign the result from each loop to your array.
However, I think you need to create two for loops here:
for ii = 1:N
    for j = 1:52
        ...
    end
end
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