Why strrep() is unable to replace the string of following code.

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sachin k p 2018-9-4

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https://ww2.mathworks.cn/matlabcentral/answers/417523-why-strrep-is-unable-to-replace-the-string-of-following-code

回答： Walter Roberson 2018-9-4

I have copied the entire content of the file to X.

ff='Downloads\python.txt';
fid=fopen(ff,'rt');
X = fread(fid) ;
fclose(fid) ;
X = string(X.') ;
Y = strrep(X,'name','verify') ;
fid = fopen(ff,'r+') ;
fprintf(fid,'%s',Y);
fclose (fid) ;

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Geoff Hayes 2018-9-4

sachin - have you confirmed that name appears in your X? Is python.txt a text file or a binary file? (maybe this doesn't matter).

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Answer 1

Walter Roberson 2018-9-4

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https://ww2.mathworks.cn/matlabcentral/answers/417523-why-strrep-is-unable-to-replace-the-string-of-following-code#answer_335442

fread() defaults to using 'uint8=>double' so the results would all be in the range 0 to 255 . string() of that is going to result in a string array in which each entry is "0" to "255", and each byte was a separate string entry -- so each one is going to be 1, 2, or 3 characters long. None of those are going to match the four character long string 'name' as none of them are going to be anything other than characters that represent digits.

Consider using fileread() instead of fopen/fread/fclose .