Decompressing *.7Z Files with MATLAB

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Matlab2010 on 28 Oct 2014
Commented: ZHIWEI WANG on 11 Jun 2021
I have a 7z file. I wish to decompress it using Matlab. How can I do this? The inbuilt matlab functions dont support it.
I have tried,
[status,result] = system(['"C:\Program Files\WinRAR\UnRAR.exe" e ' E:\myFile.7z ' >null']);
however this fails as it gives
result =
UNRAR 5.11 freeware Copyright (c) 1993-2014 Alexander Roshal
E:\myFile.7z is not RAR archive
No files to extract
On closer inspection unrar.exe is not the same as winrar (which can do 7z). Hence i download 7-zip
[status,result] = system(['"C:\Program Files\7-Zip\7z.exe" e ' E:\myFile.7z]);
result =
7-Zip [64] 9.20 Copyright (c) 1999-2010 Igor Pavlov 2010-11-18
Processing archive: E:\myFile.7z
Error: Can not open file as archive
any ideas?

Accepted Answer

Matlab2010 on 29 Oct 2014
Edited: Matlab2010 on 22 Nov 2014
[status,result] = system(['"C:\Program Files\7za920\7za.exe" -y x ' '"' filename{f} '"' ' -o' '"' outputDir '"']);
Also, just in case anyone finds it useful, compressing a file with winrar is done by:
[status,result] = system(['"C:\Program Files\WinRAR\Rar.exe" a ' 'C:\Users\user\Desktop\8736_test.rar ' ' C:\Users\user\Desktop\8736.mat' ' >null']);
Walter Roberson
Walter Roberson on 7 May 2019
system() out to the appropriate bzip2 or bunzip program with the appropriate options
It appears that some versions of gzip can handle .tar.bz2 files when given appropriate options.

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More Answers (1)

Jake August
Jake August on 19 Apr 2016
This was very helpful. Someone else looking might find this useful.
% for 7zip 15.14 x64
file7z = 'D:\my.7z';
% rest of code
[dir7z,~,~] = fileparts( file7z );
dir7z = ['"' dir7z '"'];
file7z = ['"' file7z '"'];
[status,cmdout] = system( ['"C:\Program Files\7-Zip\7z.exe" x -o',dir7z,' ',file7z] );


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