textscan loop works on windows but not on macOS - why?
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Ekaterina Avershina
el 1 de Dic. de 2017
Comentada: Walter Roberson
el 16 de Ag. de 2022
Hi all,
I have a list of files that i need to open, schematically the script looks like:
for i=1:length(files)
x=fopen(files{i});
data=textscan(x, -all-the-formatspecs-);
fclose(x)
end
The script works perfectly fine on windows and goes through all the files in the list. When the script is run on macOS, though, an 'invalid file identifier' error message pops up after it's gone through the loop couple of times. Also, there is no consistency on -when- it crashes. sometimes after it's gone through 10 files, sometimes - through 2... If i try to open the file it crashed on, individually using same commands - it works... What can be the problem?
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Respuesta aceptada
Guillaume
el 1 de Dic. de 2017
Editada: Guillaume
el 1 de Dic. de 2017
To find out why fopen failed to open a file, change your script to:
for i=1:length(files)
[fid, errmsg]=fopen(files{i});
assert(fid > 0, 'Failed to open "%s" because %s', files{i}, errmsg);
data = textscan(fid, -all-the-formatspecs-);
fclose(fid)
end
This should give you a better description of the problem.
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Más respuestas (3)
Ekaterina Avershina
el 1 de Dic. de 2017
Editada: Ekaterina Avershina
el 1 de Dic. de 2017
3 comentarios
Walter Roberson
el 16 de Ag. de 2022
dirname is a character vector that is being provided by the user; @Ekaterina Avershina coded it at https://www.mathworks.com/matlabcentral/answers/370404-textscan-loop-works-on-windows-but-not-on-macos-why#answer_294131
Ekaterina Avershina
el 1 de Dic. de 2017
1 comentario
Stephen23
el 1 de Dic. de 2017
Using ls and cellstr to get filenames
files=cellstr(ls(['./' dirname]));
is quite unusual. Standard MATLAB practice is to use dir, and loop over the structure that it returns: this gives the same behavior on all OS's. See the MATLAB documentation:
or FAQs:
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