How do I sort filenames containing text and numbers in numerical order in MATLAB?

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Brad
Brad 2017 年 10 月 10 日
編集済み: Stephen 2021 年 4 月 18 日
I have a series of .png files in a folder whose names are the following;
(A)Test_Nom_BAUD1.png
(A)Test_Nom_BAUD7.png
(A)Test_Nom_BAUD8.png
(A)Test_Nom_BAUD10.png
(A)Test_Nom_BAUD11.png
In reading the MATLAB documentation, I understand the dir function sorts strings in ASCII dictionary order. And since the files I'm using have no leading zeros, this is a problem. This is exactly what I'm seeing when I use the dir function:
A = dir('*.png');
(A)Test_Nom_BAUD1.png
(A)Test_Nom_BAUD10.png
(A)Test_Nom_BAUD11png
(A)Test_Nom_BAUD7.png
(A)Test_Nom_BAUD8.png
But what I need is this;
A = dir('*.png');
(A)Test_Nom_BAUD1.png
(A)Test_Nom_BAUD7.png
(A)Test_Nom_BAUD8.png
(A)Test_Nom_BAUD10.png
(A)Test_Nom_BAUD11.png
I know this can be done if the filenames contain only numbers.
But is it possible to sort these filenames (in numerical order) using existing text manipulation and sorting routines in MATLAB? If so, how?
  2 件のコメント
Msutto51
Msutto51 2020 年 2 月 6 日
Natsortfiles works perfectly!!! thanks !

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採用された回答

Cedric Wannaz
Cedric Wannaz 2017 年 10 月 10 日
編集済み: Cedric Wannaz 2017 年 10 月 10 日
If, for any reason, you cannot install this function, you can sort your filenames as follows:
[~, reindex] = sort( str2double( regexp( {A.name}, '\d+', 'match', 'once' )))
A = A(reindex) ;
Note that it assumes that all files have the same base name. If you have to deal with various base names, then you need the function mentioned in the other answers, or to work a little more on the sorting.
  5 件のコメント
Stephen
Stephen 2018 年 9 月 21 日
"You'll have to write a custom parsing routine to extract out the numbers you want into numerical vectors then sort them yourself."
You don't have to do that at all: natsortfiles handles multiple number values already. Just provide an appropriate regular expression, and it will work just fine:
>> C = {...
'RSN1112-KOBE-1.1_Node_Floor_Dsp.out',...
'RSN1111-KOBE-0.2_Node_Floor_Dsp.out',...
'RSN1112-KOBE-0.2_Node_Floor_Dsp.out',...
'RSN1111-KOBE-0.1_Node_Floor_Dsp.out',...
'RSN1111-KOBE-1.1_Node_Floor_Dsp.out',...
'RSN1112-KOBE-0.1_Node_Floor_Dsp.out'};
>> natsortfiles(C,'\d+\.?\d*') % alphanumeric sort
ans =
'RSN1111-KOBE-0.1_Node_Floor_Dsp.out'
'RSN1111-KOBE-0.2_Node_Floor_Dsp.out'
'RSN1111-KOBE-1.1_Node_Floor_Dsp.out'
'RSN1112-KOBE-0.1_Node_Floor_Dsp.out'
'RSN1112-KOBE-0.2_Node_Floor_Dsp.out'
'RSN1112-KOBE-1.1_Node_Floor_Dsp.out'

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その他の回答 (2 件)

KSSV
KSSV 2017 年 10 月 10 日
  2 件のコメント
Jan
Jan 2017 年 10 月 10 日
Really? But it is on the same server as the forum. Perhaps it works if you insert your country code:

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