replace dlmread file name with a variable in a loop

Question

Avik Mahata 2022-6-12

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1738930-replace-dlmread-file-name-with-a-variable-in-a-loop

回答： Avik Mahata 2022-6-12

I have around 20 files needed to be read and plotted. So the file names are such as file.288.10 , file.288.100 etc. I have 20 files. I am tryng in the following code, but its not reading T and P.

for T = [288 299 308 323 337]
    for P = [10 100 340 544]         
        M = dlmread('file.T.P', ' ', 1, 0);
        figure 
        plot (M(:,1), M(:,2))
        hold on
        plot (M(:,1), M(:,3))
        hold on
    end
end

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Answer 1

Image Analyst 2022-6-12

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https://ww2.mathworks.cn/matlabcentral/answers/1738930-replace-dlmread-file-name-with-a-variable-in-a-loop#answer_984075

在 MATLAB Online 中打开

Maybe this:

folder = pwd; % Or wherever you want
for T = [288 299 308 323 337]
    for P = [10 100 340 544]
        baseFileName = sprintf('file.%d.%d.csv', T, P); % Change extension if it's not csv.
        fullFileName = fullfile(folder, baseFileName);
        if isfile(fullFileName)
            M = readmatrix(fullFileName);
            figure 
            plot (M(:,1), M(:,2), 'b-', 'LineWidth', 2)
            grid on;
            hold on
            plot (M(:,1), M(:,3), 'r-', 'LineWidth', 2)
            legend('Column 2', 'Column 3');
            title(baseFileName, 'FontSize', 18)
        else
            fprintf('Warning: file not found : "%s".\n', fullFileName)
        end
    end
end

If that doesn't work, attach two of your files in a zip file after reading this:

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Answer 2

dpb 2022-6-12

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https://ww2.mathworks.cn/matlabcentral/answers/1738930-replace-dlmread-file-name-with-a-variable-in-a-loop#answer_984080

在 MATLAB Online 中打开

You've got to turn the numerics into string filename to build dynamically --

for T = [288 299 308 323 337]
  for P = [10 100 340 544]
    fname=sprintf('file%d.%d',T,P);
    M = dlmread(fname,' ', 1, 0);
    figure 
    plot (M(:,1), M(:,2:3))
  end
end