How to read files from sub folders in sorted order?

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Parthiban C
Parthiban C 2018-8-10
评论： Stephen23 2022-1-19
Sub folder names are something like this. Time_0, Time_0.5, Time_1, Time_2, Time_10. The file name in all the sub folders are same. Matlab sort these folder names in the order Time_0, Time_0.5, Time_1, Time_10, Time_2. But I want the files to be loaded from smallest to largest time. Someone Please help me with this?
  2 个评论
kondepati sudhir kumar
kondepati sudhir kumar 2019-11-7
the answer by konard and stephen is good but if you sort by time does'nt give good results then you can use this code
d = dir('Time*');
for i=1:length(d)
folder(i,1)=string(d(i).name);
end
t_char = regexp(folder,'\_','split');
ar= str2double(ar);
[~,idx] = sort(ar);
folder = folder(idx);
Stephen23
Stephen23 2022-1-19
编辑：Stephen23 2022-1-19
"the answer by konard and stephen is good but if you sort by time does'nt give good results..."
My answer doesn't just sort by "Time", but sorts by the entire content of the foldernames, incuding the number values.

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回答（2 个）

Konrad
Konrad 2018-8-10
编辑：Konrad 2018-8-10
Hi, one solution would be to convert the time suffix to numeric and sort the numbers:
d = dir('Time*');
n = {d.name};
t_char = regexp(n,'\-?[\d\.]+$','match','once');
t_num = str2double(t_char);
[~,idx] = sort(t_num);
d_sort = d(idx);
Hope this helps. Best, Konrad
Stephen23
Stephen23 2018-8-10
编辑：Stephen23 2022-1-19
The simplest solution is to download my FEX submission natsortfiles, which was written to solve exactly the problem that you are having:
https://www.mathworks.com/matlabcentral/fileexchange/47434-natural-order-filename-sort
There are plenty of examples in the Mfile help, the online documentation, and also in the HTML examples. Note that
  • because the numbers include decimal values you will need to specify the regular expression.
  • because you are sorting foldernames you will need to specify the 'noext' option.
D = 'path where subfolders are';
S = dir(fullfile(D,'Time_*'));
S = natsortfiles(S([S.isdir]),'\d+\.?\d*','noext')
  1 个评论
Stephen23
Stephen23 2022-1-19
Ran in:
Example using a cell array:
C = {'Time_0', 'Time_1.5', 'Time_9.5', 'Time_1', 'Time_10', 'Time_2.5'};
D = natsortfiles(C,'\d+\.?\d*','noext')
D = 1×6 cell array
{'Time_0'} {'Time_1'} {'Time_1.5'} {'Time_2.5'} {'Time_9.5'} {'Time_10'}

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