problem with sorting a structure

Question

Efstathios Kontolatis 2016-9-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/303026-problem-with-sorting-a-structure

回答： KSSV 2016-9-14

采纳的回答： Andrei Bobrov

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I have a structure created by the dir command so I have something like that

images=dir('file*.tif')

The problem is that the struct created has its names that go like this

file1.tif
file10.tif
file2.tif
file20.tif

I want to sort all the contents of the struct so that it'll go like

file1.txt
file2.txt
file3.txt
...
file10.txt

But I want to do it without using cells. Just to sort the structure. Is there a way to do so?

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Answer 1

Andrei Bobrov 2016-9-14

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https://ww2.mathworks.cn/matlabcentral/answers/303026-problem-with-sorting-a-structure#answer_234689

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images=dir('file*.tif');
n = {images.name}';
[~,ii] = sort(str2double(regexp(n,'(?<=file)\d*(?=\.txt)','match','once')));
images = images(ii);

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Efstathios Kontolatis 2016-9-14

Thank you very much that worked fine for me

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Answer 2

KSSV 2016-9-14

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/303026-problem-with-sorting-a-structure#answer_234687

You may use the following submissions in file exchange:

http://in.mathworks.com/matlabcentral/fileexchange/10959-sort-nat--natural-order-sort

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

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Efstathios Kontolatis 2016-9-14

Thank you for your answer. However, this links use cell arrays. I don't want to convert my struct to a cell. I want to sort the struct in a way that I will have the same struct after executing but with the names sorted.

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Answer 3

KSSV 2016-9-14

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https://ww2.mathworks.cn/matlabcentral/answers/303026-problem-with-sorting-a-structure#answer_234690

在 MATLAB Online 中打开

Try this once and let me know:

clc; clear all ;
f=dir('file*.txt') ;  % get txt files in the folder 
nfiles = length(f) ;  % total number of files 
iwant = zeros(nfiles,1) ;  % numbers at the end of files
for i = 1:nfiles
     B = regexp(f(i).name,'\d*','Match');  % get the number at the end of file 
     iwant(i) = str2num(B{1}) ;
end
%%Sort the numbers iwant
[val,idx] = sort(iwant) ;   % sorting the numbers 
sort_f = f(idx) ;