Mat_VarRead3

Usage

Overview

The Mat_VarRead() function reads the information and data for the variable 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 %s0, 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;
}