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

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Maider Marin
Maider Marin 2011-11-17
评论： Steven Lord 2019-4-10
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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采纳的回答

Jan
Jan 2011-11-17
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.
  1 个评论
Steven Lord
Steven Lord 2019-4-10
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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更多回答（2 个）

James Tursa
James Tursa 2019-4-10
Version info for mex routines can be found in this FEX submission:
https://www.mathworks.com/matlabcentral/fileexchange/67016-c-mex-matlab-version
Kaustubha Govind
Kaustubha Govind 2011-11-17
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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