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How to find Matlab version to be used in the mex file header

Asked by Maider Marin on 17 Nov 2011
Latest activity Commented on by Steven Lord
on 10 Apr 2019
Accepted Answer by Jan
I create a mex file that compiles and works properly in R2010b and up, versions I have at my work. But I need the same file be used in R2010a, since that's the version I have in my laptop. If I used in R2010 I have an error. I found the code need it to make it work. But every time I switch I have to comment and uncomment. Is there any way to find Matlab's version in the header? Let me give some code:
#include <stdlib.h>
#include <vector>
#include <queue>
#include <limits>
#include <utility>
#include <map>
#include <assert.h>
#include <stdio.h>
/* #ifdef _CHAR16T //for matlab 2010a
#define CHAR16_T
#endif */
#include "mex.h"
#include "matrix.h"
using namespace std;
........code ............
The commented section is my fix. I want to find Matlab's version and put an if statement so it automatically applies my fix. I try this:
int i;
int j;
sscanf(version,'%d.%d %*s',&i, &j)
#if i<=7 && j<11
#ifdef _CHAR16T //for matlab 2010a
#define CHAR16_T
#endif
#endif
but it did not work since c++ did not find the "version" variable defined in matlab. Does somebody know how to do that? I really appreciate any help!

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3 Answers

Answer by Jan
on 17 Nov 2011
 Accepted Answer

Does the problem concern the Matlab version, or is it caused by different compilers?
Would it work to check if CHAR16_T is defined already?
#ifndef CHAR16_T
Butr if the problem really concerns the Matlab version, I suggest to append a flag to the MEX call:
function myMex(varargin)
V = [100, 1] * sscanf(version, '%d', 2); % Consider 7.10!
if V < 711
Flag = {'-DNEED_CHAR_16_T'};
else
Flag = {};
end
mex(varargin{:}, Flag{:});
I started with some equivalen flags to distinguish Matlab 5.3 and 6.5. Meanwhile my enhanced MEX function has 500 lines, considers different mexopt.bat files, e.g. enable SSE2 commands under 32-bit Matlab, but avoid this under 64 bit, if MSVC2010 ist used, etc.

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V = [100, 1] * sscanf(version, '%d', 2); % Consider 7.10!
The verLessThan function was introduced in release R2007a. You can wrap it in a try / catch statement if you need to run the code in release R2006b or earlier, and use this technique in the catch block to distinguish release R2006b and earlier releases.

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Answer by James Tursa
on 10 Apr 2019

Version info for mex routines can be found in this FEX submission:

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Answer by Kaustubha Govind on 17 Nov 2011

You can use the ver command to obtain version information in MATLAB:
>> v=ver('MATLAB')
v =
Name: 'MATLAB'
Version: '7.13'
Release: '(R2011b)'
Date: '08-Jul-2011'
However, it's not clear to me how you plan to use this information in your MEX-file. Since #defines are used by the pre-processor, what you're doing won't work at run-time. Do you plan to re-compile the C code every time before it is executed?

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