Multiple Matlab installations with diferent mex compiler?

If I have many different Matlab installations (both 32-bit and 64 bit) I need also different mex compiler but it seeems that the installations uses the same directory to store this information (c:\matlab_prefdir) so the latest setting is used on all installations. How can i change this to use different folders for different Matlab versions?

Answer 1

[Titus Edelhofer]

Hi Jonas,

multiple MATLAB installations do not share the same preferences, but 32/64 bit, that's right. One simple strategy is to add a file startup.m to matlab\toolbox\local (or some other folder, that you use as startup folder in Windows), and put a line similar to

mex -setup:C:\MATLAB\R2014b\bin\win64\mexopts\msvc2012.xml

into it. This way you do the mex setup each time you start a MATLAB version.

Titus

Answer 2

[Jonas]

Hmmm, I have 2012b 64-bit and 2013b 32-bit installed and they both point to c:\matlab_prefdir

I note that I have an environment variable MATLAB_PREFDIR set to this folder. I will try to remove this and see I get different folders!

[Titus Edelhofer]

That could be the reason. Usually it's on Windows something like

C:\Users\username\AppData\Roaming\MathWorks\MATLAB\R2014b

Titus