code to load my files from folder, add workspace variable and save to another folder

Question

Mohammad Zakaie Far 2020-10-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/622903-code-to-load-my-files-from-folder-add-workspace-variable-and-save-to-another-folder

评论： Mohammad Zakaie Far 2020-10-22

采纳的回答： Stephen23

Dears,

I have a lot of .mat files wich I want to add a variable fs=128 to all of the one by one.

one way is to load ech other, add variable and save, which takes some days because of thousands data.

so I need a code (i.e. for loop) to load each one, add same variable and save it.

please help me.

thank you.

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Answer 1

Stephen23 2020-10-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/622903-code-to-load-my-files-from-folder-add-workspace-variable-and-save-to-another-folder#answer_521703

编辑：Stephen23 2020-10-22

在 MATLAB Online 中打开

You don't need to load the file data, you can use save's '-append' option:

fs = 128;
for ... loop over all files, you need to finish this line yourself!
   fnm = 'name_of_the_file.mat'; % change this depending on how you generate/index the filenames.
   save(fnm,'fs','-append')
end

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Stephen23 2020-10-22

编辑：Stephen23 2020-10-22

在 MATLAB Online 中打开

"it is not work"

You will need to actually loop over the files using one of the methods shown in the documentation:

https://www.mathworks.com/help/matlab/import_export/process-a-sequence-of-files.html

For example, something like this:

fs = 128;
D = 'absolute or relative path to the folder where the files are saved'; % !!! YOU NEED TO CHANGE THIS !!!
S = dir(fullfile(D,'*.mat'));
for 1:numel(S)
   fnm = fullfile(D,S(k).name);
   save(fnm,'fs','-append')
end