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Sorting files in struct according to time in filename

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Mathew Smith
Mathew Smith 2024-3-21
评论： Stephen23 2024-3-21
Hello,
I have jpg images with names:
t_=_15_s.jpg
t_=_30_s.jpg
...
t_=_900_s.jpg
and I read them using dir(*.jpg) command. Unfortunatelly, they are sorted wrongly (they start with t_=_105_s.jpg), and I would like to correct it.
I would like to ask you for help.
BR
Mathew
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Mathew Smith
Mathew Smith 2024-3-21
The cyclist: I have uploaded images with the numbers to the original question so you can try.

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回答（1 个）

Stephen23
Stephen23 2024-3-21
编辑：Stephen23 2024-3-21
You could download my FEX submission NATSORTFILES():
https://www.mathworks.com/matlabcentral/fileexchange/47434-natural-order-filename-sort
And use it like this:
S = dir('*.jpg');
S = natsortfiles(S);
Or use sufficient leading zeros in the filenames.
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Voss
Voss 2024-3-21
Ran in:
If you can't use natsortfiles, here is an alternative:
unzip images
S = dir('*.jpg');
The original order:
{S.name}.'
ans = 22x1 cell array
{'images_105.jpg'} {'images_120.jpg'} {'images_135.jpg'} {'images_15.jpg' } {'images_150.jpg'} {'images_165.jpg'} {'images_180.jpg'} {'images_195.jpg'} {'images_210.jpg'} {'images_225.jpg'} {'images_240.jpg'} {'images_255.jpg'} {'images_270.jpg'} {'images_285.jpg'} {'images_30.jpg' } {'images_300.jpg'} {'images_315.jpg'} {'images_330.jpg'} {'images_45.jpg' } {'images_60.jpg' } {'images_75.jpg' } {'images_90.jpg' }
Sort:
[~,idx] = sort(str2double(regexp({S.name},'\d+','match','once')));
S = S(idx);
Now they are sorted:
{S.name}.'
ans = 22x1 cell array
{'images_15.jpg' } {'images_30.jpg' } {'images_45.jpg' } {'images_60.jpg' } {'images_75.jpg' } {'images_90.jpg' } {'images_105.jpg'} {'images_120.jpg'} {'images_135.jpg'} {'images_150.jpg'} {'images_165.jpg'} {'images_180.jpg'} {'images_195.jpg'} {'images_210.jpg'} {'images_225.jpg'} {'images_240.jpg'} {'images_255.jpg'} {'images_270.jpg'} {'images_285.jpg'} {'images_300.jpg'} {'images_315.jpg'} {'images_330.jpg'}
Stephen23
Stephen23 2024-3-21
"I can't install these extensions to my Matlab, but thank you for help."
MATLAB files do not need to be installed: if you can write your own file then you can use this code too.
Just unzip the ZIP-file into the current directory and use it.

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