How to process the data from a table.txt file from a series of folders and save the output in the sa-CodePudding

Could you please help me to read the data from a table.txt in a series of subfolders from a directory? In all the subfolders, the output to read has the same name, 'table.txt'. I want to process the data and save the output in the same folder.I can process it using the following code.

I can process it using the following code.

   a = readmatrix('table.txt');
   a4 = a(:,4);
   a4 = a4 - mean(a4);
   N = 2^(nextpow2(length(a4)));
   freq = (abs(fftshift(fft(a4,N)))); 

   t=[0:1e-12:20e-9].';
   ts=t(2)-t(1);
   F = ((-N/2:N/2-1)/N)*(1/ts);

   fmr=[(F(N/2 1:end)/1e9)' freq(N/2 1:end)];
   writematrix(fmr, 'fmr.csv');
   cd folder

But how to perform the same action on all the subfolders?
Could somebody please help me out?

CodePudding user response：

You can use the "find files in subfolders" behaviour of dir. Something like this:

allTables = dir('**/table.txt');
for ii = 1:numel(allTables)
    thisFolder = allTables(ii).folder;
    inFile = fullfile(thisFolder, allTables(ii).name);
    a = readmatrix(inFile);    
    % do stuff ...
    fmr = ...
    outFile = fullfile(thisFolder, 'fmr.csv');
    writematrix(fmr, outFile);
end