Mex files: how to return an already allocated matlab array

Question

I have found a really tricky problem, which I can not seem to fix easily. In short, I would like to return from a mex file an array, which has been passed as mex function in

Answer 1

You should use mxDuplicateArray, thats the documented way:

#include "mex.h"

void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
    plhs[0] = mxDuplicateArray(prhs[0]);
}