MATLAB: How to determine the MATLAB version when compiling C/C++ mex files

cdefineMATLABmexversion

MATLAB's C/C++ mex interface changes from time to time, with new releases of MATLAB. Functionality can be added, removed or changed. In order to write a C/C++ mex file which can be compiled by different versions of MATLAB, it might be necessary to have separate code for these different versions, selected using pre-processor macros. To do this, there needs to be a #define in mex.h which states the MATLAB version. Is there such a #define, and if so, what is it called?

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This has been a problem for a long time now. And even if modern Matlab versions define the constant MX_API_VER, this is not defined in older versions.

I'm using a Matlab-function to call mex, which defines:

matlabV = [100, 1] * sscanf(version, '%d.%d', 2);
Args    = {sprintf('-DMATLABVER=%d', matlabV)};

Then the constant MATLABVER is e.g. 802 for Matlab 8.02.

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MATLAB: How to determine MEX API version

I have a complicated macro to detect API version at compile time that I could post, but if you are only trying to deal with the mwSize and mwIndex stuff you can check for MWSIZE_MAX. E.g.,

#ifndef MWSIZE_MAX
    #define  mwIndex        int
    #define  mwSignedIndex  int
    #define  mwSize         int
#endif

MATLAB: Can I call mex function in other mex functions

The easiest and most efficient solution would be to avoid the overhead of calling a MEX function, but to embed the needed code directly in the other mex function.

But it is possible to call another MEX function by mexCallMATLAB. There is an undocumented function called "mexRunMexFile" also, but as usual for undocumented commands: This is fragile.

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