Writing a loop for processing the data in multiple text files in a folder

Question

Luke Askew 2021-11-25

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https://ww2.mathworks.cn/matlabcentral/answers/1595919-writing-a-loop-for-processing-the-data-in-multiple-text-files-in-a-folder

回答： Shanmukha Voggu 2021-11-29

I'm attempting to process data from a folder with multiple text files, I want to take specific rows/columns from said text files and by applying the reshape/mean function I want to process each text file into a new set of data and write it into a new text file.

Files = dir('C:\Users\lukeaskew\Documents\MATLAB\SpineParametersData');

N = length(Files)

% loop for each file

for i = 1:N

thisfile = Files(i).txt;

AvLx = mean(reshape(thisfile(1:168, 2),28, []));

AvLy = mean(reshape(thisfile(1:168, 3), 28, []));

AvHx = mean(reshape(thisfile(179:192, 2), 14, []));

AvHy = mean(reshape(thisfile(179:192, 3), 14, []));

D = reshape(Avx,6,1);

E = reshape(Avy,6,1);

F = reshape(AvHx,1,1);

G = reshape(AvHy,1,1);

H = [D(:), E(:)];

I = [F(:), G(:)];

J = cat(1,H,I)

writematrix(J,'C:\Users\lukeaskew\Documents\MATLAB\SPDav\%d.txt', i)

end

The issue I am having is that when I print the value of N I get 0 and so the loop does not run through the folder, nor does it ultimately produce the datasets I require.

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Stephen23 2021-11-25

编辑：Stephen23 2021-11-25

在 MATLAB Online 中打开

Probably you should specify a filename with widlcard characters, e.g.:

P = 'C:\Users\lukeaskew\Documents\MATLAB\SpineParametersData';
S = dir(fullfile(P,'*.txt'));
for k = 1:numel(S)
    F = fullfile(P,S(k).name);
    ..
end