MATLAB: MEXCallMatlab very slow. Suggest alternate

mexmex compiler

Hi, I am working on a MEX file. I am using MEXCallMatlab which is very slow to call matlab inbuilt function as well as user defined function. It is not possible for me to make mex for other files since they are in large number and each of them is calling many in-built. Thanks.

Best Answer

mexCallMATLAB is slow. Calling built-in Matlab functions from a MEX is no good idea.

Related Solutions

MATLAB: Building Mex file with Fortan

Your main problem is that you need to create the output array PLHS(1) before you access it. Also your NLHS and NRHS types are wrong. Try this:

#include <fintrf.h>
C
C Gateway routine
C
    SUBROUTINE MEXFUNCTION(NLHS, PLHS, NRHS, PRHS)
    implicit none
C mexFunction arguments:
    MWPOINTER PLHS(*), PRHS(*)
    INTEGER NLHS, NRHS
    mwPointer, external :: mxGetPr, mxGetPi
    mwPointer, external :: mxCreateDoubleMatrix, mxCreateNumericArray
    mwSize, external :: mxGetM, mxGetN
    MWPOINTER YPP 
    mwSize M, N
    integer*4 ComplexFlag
    REAL *8 RYPP(1)
    RYPP(1) = 10
    M = 1
    N = 1
    ComplexFlag = 0
    PLHS(1) = mxCreateDoubleMatrix( M, N, ComplexFlag )
    YPP = MXGETPR(PLHS(1))
    CALL MXCOPYREAL8TOPTR(RYPP, YPP, M*N)
    RETURN
    END

MATLAB: Passing value from mex file to Matlab

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.

Best Answer

Related Solutions

MATLAB: Building Mex file with Fortan

MATLAB: Passing value from mex file to Matlab

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