Why is OpenMP in a mex file only producing 1 thread?

Question

I am new to OpenMP. I have the following code which compiles fine using Matlab mex configured with MSVS2010. The computer has 8 processors available (which I checked also by usi

Answer 1

Sigh. Typical, spend hours trying and failing and then find the answer 5 minutes after posting to SO.

The file needs to be mexed with openmp support

mex mexIndexedCopy.cpp COMPFLAGS="/openmp $COMPFLAGS"