Script works on Windows OS but not on MacOS

Question

Ferhat Kangal 2022-12-22

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https://ww2.mathworks.cn/matlabcentral/answers/1883057-script-works-on-windows-os-but-not-on-macos

评论： Steven Lord 2022-12-22

Hello everybody,

I am trying to SMOTE data augmentation for a image dataset but the script I evaluate works on Windows OS but not on MacOS. Part of the code is below and it's like;

labels=[];info=strfind(files,'\');
Unrecognized function or variable 'files'.
for i=1:numel(files)
    idx=info{i};
    dirName=files{i};
    targetStr=dirName(idx(end-1)+1:idx(end)-1);
    targetStr2=cellstr(targetStr);
    labels=[labels;categorical(targetStr2)];
end

and the error I'm having is;

Array indices must be positive integers or logical values.
Error in smote (line 24)
    targetStr=dirName(idx(end-1)+1:idx(end)-1);

anyone has any idea why I'm having that problem?

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Answer 1

Jan 2022-12-22

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https://ww2.mathworks.cn/matlabcentral/answers/1883057-script-works-on-windows-os-but-not-on-macos#answer_1134097

编辑：Jan 2022-12-22

在 MATLAB Online 中打开

Use the debugger to identify the problem. Type this in the command window:

dbstop if error

Then run the code again. If Matlab stops at the error, check the values of the variables:

dirName
idx
idx(end-1)+1
idx(end)-1

If idx is a scalar, idx(end-1) requests the 0th element, which is failing.

This can happen, because MacOS and Windows use different file separators. Therefore this is a bad idea:

info=strfind(files,'\');
% Better:
info=strfind(files, filesep);

Another option is to use fileparts instead of handmade parsing of paths.

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Ferhat Kangal 2022-12-22

Thanks for your reply. I have just solved the problem using "/" instead of "\". Thank you!

Steven Lord 2022-12-22

You haven't fixed the problem by switching from hard-coded '\' to hard-coded '/'. You've just changed on which OS your code works and on which OS it doesn't.

I second Jan's suggestions to use either filesep or fileparts (and if you need to reassemble a file path from parts use fullfile.)

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