To resolve issues starting MATLAB on Mac OS X 10.10 (Yosemite) visit: http://www.mathworks.com/matlabcentral/answers/159016
I would like to determine if I am running a 32-bit version of MATLAB or a 64-bit version of MATLAB.
For MATLAB 7.8 (R2009a) and later versions, you can determine this information by selecting the "Help>About MATLAB" Menu from the desktop.
The information also appears on the splash screen as MATLAB is starting.
If you are running MATLAB without the desktop interface, the information appears in the command window when MATLAB starts.
For previous product releases, you can determine if the version of MATLAB you are running is 32-bit or 64-bit by using the following function:
The following is the interpretation table to the ouptut of the above command:
OUTPUT OF COMPUTERVERSION OF MATLAB (32 bit / 64 bit)
PCWIN32 bit MATLAB on Windows
PCWIN6464 bit MATLAB on Windows
GLNX8632 bit MATLAB on Linux
GLNXA6464 bit MATLAB on Linux
You can specifically probe for the MATLAB bitness by using the following command:
This will return win64 for 64-bit MATLAB and win32 for 32-bit MATLAB.
You can also determine if you are running 32 or 64 bit MATLAB using the MEXEXT function which gives you the extension of the mex file generated by MATLAB:
OUTPUT OF MEXEXTVERSION OF MATLAB (32 bit / 64 bit)
mexw3232 bit MATLAB on Windows
mexw6464 bit MATLAB on Windows
mexglx32 bit MATLAB on Linux
mexa6464 bit MATLAB on Linux
mexmac32 bit MATLAB on Mac
mexmaci32 bit MATLAB on Intel-based Mac
mexmaci6464 bit MATLAB on Intel-based Mac