passing value from mex file to Matlab

Am writing a multi threaded program in Matalb..Hence am taking the support of Mex to do...Am having some set of variable in the mex space..which I want to return it back to the Matlab workspace..Please somebody tell how to do it..

[Jan]

The question is too vague to be answered. In my MEX programs the results are collected in one array and replied as Matlab-array. But I do not think, that this is helpful already.

[sandeep]

sorry its like am having a function in a cpp program like

 void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray
 *prhs[])
{
double y=10;
}

I want to do some more manipulation on the value y in this function and return it to Matlab workspace...To do this I executed mex which created mexw64 file...Upton execution of this file I want to value y to be available to matlab workspace...Is it possible?

Answer 1

[Friedrich]

Hi,

#include "mex.h"

void manipulate(double* y){
 *y = 20;   
}

void mexFunction( int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
    plhs[0] = mxCreateDoubleScalar(10);
    //uncomment this get the the value 20 in MATLAB, otherwise you get 10
    //manipulate(mxGetPr(plhs[0]));
}

Overall i think the best is to get started in the MEX documentation or here or take a look at some examples.