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Man Pages
MAT_VARWRITE(3) FreeBSD Library Functions Manual MAT_VARWRITE(3)

Mat_VarWrite
Writes a MATLAB variable to a MATLAB MAT file.

#include <matio.h>
int
Mat_VarWrite(mat_t *matfp, matvar_t *matvar, enum matio_compression compress);

The Mat_VarWrite() function writes the MATLAB variable matvar to the MAT file matfp which must be opened for writing. If the MAT file is a version 5 or HDF5 MAT file, the compress option allows the variable to be written using zlib compression if available. If compression is not available, the variable is written uncompressed.

The function returns 0 if the variable was successfully written to the MAT file. Otherwise, an error value is returned.

This example program creates a MAT file named by the first argument to the program, and writes the variable named m_pi to the file.
#include <math.h> 
#include "matio.h" 
 
int 
main(int argc,char **argv) 
{ 
    mat_t    *matfp; 
    matvar_t *matvar; 
    size_t    dims[2] = {1,1}; 
    double    m_pi = M_PI; 
 
    matfp = Mat_CreateVer(argv[1],NULL,MAT_FT_DEFAULT); 
    if ( NULL == matfp ) { 
        fprintf(stderr,"Error creating MAT file %s0,argv[1]); 
        return EXIT_FAILURE; 
    } 
 
    matvar = Mat_VarCreate("m_pi",MAT_C_DOUBLE,MAT_T_DOUBLE,2,dims,&m_pi,0); 
    if ( NULL != matvar ) { 
        Mat_VarWrite(matfp,matvar,MAT_COMPRESSION_ZLIB); 
        Mat_VarFree(matvar); 
    } 
 
    Mat_Close(matfp); 
    return EXIT_SUCCESS; 
} 

Mat_CreateVer(3), Mat_Open(3), Mat_VarRead(3), Mat_VarWriteAppend(3)
March 18, 2012 FreeBSD 12.0-RELEASE

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