mtimesx library compile error

hello

I am trying to use mtimesx on matlab 2016a, windows 10 64-bit, but I get the error " A C/C++ compiler has not been selected with mex -setup error" and understand I should change mexopts = [prefdir '\mexopts.bat']; in mtimesx_build.m to mexopts = [prefdir '\mex_C++_win64.xml']; but in path C:\Users\..\AppData\Roaming\MathWorks\MATLAB\R2016a this xml dosent exit, how could I complime this library?

Thank you

Answer 1

[James Tursa]

TMW changed the way the mex function operates a couple of years ago. Unfortunately at that time I did not have access to recent MATLAB versions so I never got around to updating the automatic build code in my FEX submission. I still don't have access to the latest versions, but in the meantime maybe you can work with a stripped down version that is basically a manual compile with no checking. You may have to manually edit the paths etc to get it to work on your machine. Hopefully in the future I will be able to fix up the automated build process.

function mtimesx_build_new
mexargs{1} = 'mtimesx.c';
mexargs{2} = '-largeArrayDims';
mexargs{3} = '-DCOMPILER=UNKNOWN'; % Edit with your compiler or leave as is

% You may need to edit this section to get the directories set properly for
% your machine. The below is for Windows, and assumes lcc for 32-bit.
comp = computer;
mext = mexext;
lc = length(comp);
lm = length(mext);
cbits = comp(max(1:lc-1):lc);
mbits = mext(max(1:lm-1):lm);
if( isequal(cbits,'64') || isequal(mbits,'64') )
    compdir = 'win64';
    libdir = 'microsoft';
else
    compdir = 'win32';
    libdir = 'lcc';
end
lib_blas = [matlabroot '\extern\lib\' compdir '\' libdir '\libmwblas.lib'];
d = dir(lib_blas);
if( isempty(d) )
    disp('... BLAS library file not found, so linking with the LAPACK library');
    lib_blas = [matlabroot '\extern\lib\' compdir '\' libdir '\libmwlapack.lib'];
end
disp(['... Using BLAS library lib_blas = ''' lib_blas '''']);
mexargs{4} = lib_blas;

% The compile
mex(mexargs{:});

return
end

[James Tursa]

If your compiler is OpenMP compliant (which it looks like it is), you might also throw in this option:

mexargs{5} = 'COMPFLAGS="$COMPFLAGS /openmp"';

Answer 2

[Walter Roberson]

First install a compiler, and then execute

mex -setup C++

at the command line. For Windows 10 and R2016a, you will need MingW, or Microsoft Visual C++ 2015 Professional, or Intel Parallel Studio XE 2016 for C/C++, or Intel Parallel Studio XE 2015 for C/C++

[armita mani]

thank you for your answer, I use Microsoft Visual C++ 2015 Professional but it didn't work .is it incompatible with matlab 2016a?

[Walter Roberson]

My understanding is that product is compatible with R2016a on Windows 10.