MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Manual de usuario descargar pdf (Pagina 103)

100

101

Advanced Topics

2-43

format, which takes twice the space. See the allocation of zout in the

example that follows.

2 Once the variable is returned to MATLAB, convert its storage so that it is

compatible with MATLAB. Use the

fort2mat function for this.

Example – Passing Complex Variables. The example below shows how to call an

LAPACK function from MATLAB, passing complex

prhs[0] as input and

receiving complex

plhs[0] as output. Temporary variables zin and zout are

used to hold

prhs[0] and plhs[0] in Fortran format.

#include "mex.h"

#include "fort.h" /* defines mat2fort and fort2mat */

void mexFunction( int nlhs, mxArray *plhs[], int nrhs, mxArray

*prhs[] )

{

int lda, n;

double *zin, *zout;

lda = mxGetM( prhs[0] );

n = mxGetN( prhs[0] );

/* Convert input to Fortran format */

zin = mat2fort( prhs[0], lda, n );

/* Allocate a real, complex, lda-by-n variable to store output */

zout = mxCalloc( 2*lda*n, sizeof(double) );

/* Call complex LAPACK function */

zlapack_function( zin, &lda, &n, zout );

/* Convert output to MATLAB format */

plhs[0] = fort2mat( zout, lda, lda, n );

/* Free intermediate Fortran format arrays */

mxFree( zin );

mxFree( zout );

}

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