Mat_VarRead (3) - Linux Manuals

Mat_VarRead: Reads the information and data for a specific variable in a MATLAB MAT file.

NAME

Mat_VarRead - Reads the information and data for a specific variable in a MATLAB MAT file.

SYNOPSIS

Fd #include <matio.h> Ft matvar_t * Fo Mat_VarRead Fa mat_t *mat Fa const char *name Fc

DESCRIPTION

The Fn Mat_VarRead function reads the information and data for the variable Fa name in the open MAT file.

RETURN VALUES

If the variable was found in the MAT file and successfully read, a pointer to the MATLAB variable structure is returned. If the variable was not found, or there was an error reading the variable, NULL is returned.

EXAMPLES

This example program opens a MAT file named by the first argument to the program, and reads a variable named x from the file. The MATIO function Mat_VarPrint is used to print the information and data from the file.

#include "matio.h"

int
main(int argc,char **argv)
{
    mat_t    *matfp;
    matvar_t *matvar;

    matfp = Mat_Open(argv[1],MAT_ACC_RDONLY);
    if ( NULL == matfp ) {
        fprintf(stderr,"Error opening MAT file %s,argv[1]);
        return EXIT_FAILURE;
    }

    matvar = Mat_VarRead(matfp,"x");
    if ( NULL != matvar ) {
        Mat_VarPrint(matvar);
        Mat_VarFree(matvar);
    }

    Mat_Close(matfp);
    return EXIT_SUCCESS;
}