How can I modifya string into a ".m" file from a new ".m" file?

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Antonio 2012-10-10

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https://ww2.mathworks.cn/matlabcentral/answers/50436-how-can-i-modifya-string-into-a-m-file-from-a-new-m-file

Hi. I'd like to know if is it possible to modify a string (or part of it) from outside, i.e. create a new ".m" file and modify, or change, strings of an existent ".m" file from the new one. Thanking you for your attention, I'm looking forward for your answers.

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Matt Kindig 2012-10-10

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Hi Antonio,

Your question is a bit unclear. Are you saying that you want to do a search/replace in the m-file, and then write out the replaced file as a new file? If so, you can either use the "Find & Replace" utility in the Matlab IDE (Ctrl+F), or you can do it in code using something like this:

str = fileread('/path/to/your/mfile.m');
newstr = strrep(str, 'oldtext1', 'replacetext1');
newstr = strrep(newstr, 'oldtext2', 'replacetext2'); 
%  etc.
%now write new file
fid = fopen('/path/to/newfile.m', 'wt');
fprintf(fid, '%s', newstr);
fclose(fid);