MATLAB: How to call Matlab functions from C S functions

MATLABs-functionsimulink

Hi,

Is it possible to call matlab functions from C S functions? I would need to call fzero and I do not wish to create another C function with the algorithm.

Thanks. Remus.

Best Answer

You can use mexCallMATLAB, but will need to create/destroy mxArrays as needed.

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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: Plot x-axis and y-axis with mexCallmatlab

You need to use the plot(x,y) form of PLOT:

   // Copy freq into an mxArray x_ptr_freq
   mxArray* x_ptr_freq = mxCreateDoubleMatrix(1, 205, mxREAL);
   memcpy(mxGetPr(x_ptr_freq), freq, sizeof(double)*205);
   ...
   mxArray *prhs[2] = {x_ptr_freq, x_ptr_gain};
   mexCallMATLAB(0,NULL,2,prhs,"plot");
   ...
   // Cleanup
   mxDestroyArray(x_ptr_freq);
   mxDestroyArray(x_ptr_gain);

Best Answer

Related Solutions

MATLAB: Building Mex file with Fortan

MATLAB: Plot x-axis and y-axis with mexCallmatlab

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