Order of filenames is wrong

Question

Nik Rocky 2020-7-3

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/558923-order-of-filenames-is-wrong

编辑： Stephen23 2020-7-4

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Hello,

I have save some measures in loop with

SNR = 30

SNR_steps = 15

-SNR:SNR_steps:SNR
ans =   -30   -15     0    15    30

I use SNR also in part of the filename and I get:

The Problem: the order of files in the folder is (-015 before -030), but I want to have -030, -015, 000, 015, 030...

Why is this happening, and how can I avoid this situation?

Thank you!

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Nik Rocky 2020-7-3

编辑：Nik Rocky 2020-7-3

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Hello Rik, thank you for response!

I'm using ubuntu 16.04. And I need this fileorder by reading and plotting wich another MATLAB script.

For every value I get a row, in this case:

Measure_020 = 
2112    0.3973 %< should be second row    
0825    0.6542 %< should be first row
5479    0.1426
5818    0.1912
5904    0.1303

I sort the data already with small script:

l = dir('**/*.mat');
for k = 1:length(l)
    [filepath,name,ext] = fileparts(l(k).name);
    Correct_Folder = l(k).folder;
    Correct_Name = l(k).name;
    Correct_Folder_Name = fullfile(Correct_Folder,Correct_Name);
    load(Correct_Folder_Name)
    disp(Correct_Name)
    temp = M(1,:);
    M(1,:)=M(2,:);
    M(2,:)=temp;
    save(Correct_Folder_Name)
end

but how can I avoid it i future?

Rik 2020-7-3

Use the function suggested in the answer below to read the filenames in the order that fills your array in the order that makes sense to you.

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Answer 1

KSSV 2020-7-3

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/558923-order-of-filenames-is-wrong#answer_460517

Use this fileexchange function:

https://in.mathworks.com/matlabcentral/fileexchange/47434-natural-order-filename-sort

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Image Analyst 2020-7-3

Not sure it will work, but there are lots of options with it to try

https://blogs.mathworks.com/pick/2014/12/05/natural-order-sorting/

Stephen23 2020-7-3

编辑：Stephen23 2020-7-4

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Note that a suitable regular expression will have to be provided as the second input argument, as by default natsortfiles uses the natsort default of matching digits only (i.e. positive integers including zero). For example:

'[-+]?\d+'

or in case you only need to match that one number:

'[-+]?\d+(?=_PLL)'

You should also return its third output argument to confirm that the required numbers are being correctly converted to numeric.

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