Mat_VarRead man page

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

Synopsis

#include <matio.h>

matvar_t *
Mat_VarRead(mat_t *mat, const char *name);

Description

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; 
} 

See Also

Mat_VarReadInfo(3), Mat_VarReadNext(3), Mat_VarPrint(3)

Referenced By

Mat_VarReadInfo(3), Mat_VarReadNext(3), Mat_VarReadNextInfo(3), Mat_VarWrite(3).

April 21, 2011