How to sort the order given by 'dir' command ???

Question

Divya 2013-6-7

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https://ww2.mathworks.cn/matlabcentral/answers/78323-how-to-sort-the-order-given-by-dir-command

编辑： Stephen23 2021-4-18

I am reading the images from a folder by using the below code

   [folder1] = uigetdir();
   f=dir(folder1);
   for k=1:size(f,1)-2
    file_n=f(k+2).name;
   end

The images in the folder are "test_base1", "test_base2", .... but the order in which 'dir' taking is "test_base1","test_base10","test_base2".. I understood that the command is taking ascii-betical order.. I have gone through the previous questions and answers. It seems complicated. Can any one give a good solution to sort the order of Images after using "dir"

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Stephen23 2016-2-22

编辑：Stephen23 2021-4-18

在 MATLAB Online 中打开

You could download my FEX submission natsortfiles:

>> S = dir('*.txt');
>> S.name
ans =
    '1.txt'
ans =
    '10.txt'
ans =
    '2.txt'
>> S = natsortfiles(S); % alphanumeric sort by filename
>> S.name
ans =
    '1.txt'
ans =
    '2.txt'
ans =
    '10.txt'

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Answer 1

Azzi Abdelmalek 2013-6-7

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/78323-how-to-sort-the-order-given-by-dir-command#answer_88045

在 MATLAB Online 中打开

file={'test_base1','test_base10','test_base2'}
[idx,idx]=sort(cellfun(@(x) str2num(char(regexp(x,'\d*','match'))),file))
new_file=file(idx)

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Divya 2013-6-8

在 MATLAB Online 中打开

I am facing an error with a different input for this expression. For file = {'test_30min1','test_30min10','test_30min2'}; it gives error as follows

    ??? Error using ==> cellfun
    Non-scalar in Uniform output, at index 1, output 1.
    Set 'UniformOutput' to false.

I tried giving "regexp(x,'\w*','match')" and many other combinations in this expression. I am not able to get the solution. May i know what is the solution for this??

Divya 2013-6-8