Mat_Rewind man page

Mat_Rewind — Rewind an open .mat file to the beginning

Synopsis

#include <matio.h>

int
Mat_Rewind(mat_t *matfp);

Description

Rewinds an open .mat file so that Mat_VarReadNext(3) or Mat_VarReadNextInfo(3) reads the first variable in the file.

Return Values

The function returns 0 on success, or -1 on failure.

Examples

The following example shows a list of variables in the MAT file, and prompts the user for the index of the variale to read. If the index is valid, the file is reset to the beginning, and variables read until the selected index is reached.

#include <stdlib.h> 
#include <stdio.h> 
#include "matio.h" 
 
int 
main(int argc,char **argv) 
{ 
    mat_t    *matfp; 
    matvar_t *matvar; 
    int       idx, num_variables; 
 
    matfp = Mat_Open(argv[1],MAT_ACC_RDONLY); 
    if ( NULL == matfp ) { 
        fprintf(stderr,"Error opening MAT file %s0,argv[1]); 
        return EXIT_FAILURE; 
    } 
 
    idx = 0; 
    while ( NULL != (matvar = Mat_VarReadNextInfo(matfp)) ) { 
        idx++; 
        printf("%3d. %s0,idx,matvar->name); 
        Mat_VarFree(matvar); 
    } 
    num_variables = idx; 
    if ( num_variables > 0 ) { 
        printf("Which variable would you like to read? "); 
        if ( 0 == fscanf(stdin,"%d",&idx) ) { 
            printf("Invalid variable selection!0); 
        } else if ( idx < 1 || idx > num_variables ) { 
            fprintf(stderr,"That is an invalid variable index!0); 
        } else { 
            int k; 
            Mat_Rewind(matfp); 
            for ( k = 1; k < idx; k++ ) { 
                matvar = Mat_VarReadNextInfo(matfp); 
                Mat_VarFree(matvar); 
            } 
            matvar = Mat_VarReadNext(matfp); 
            Mat_VarPrint(matvar,1); 
            Mat_VarFree(matvar); 
        } 
    } 
 
    Mat_Close(matfp); 
    return EXIT_SUCCESS; 
}

See Also

Mat_Open(3), Mat_Close(3), Mat_VarReadNext(3), Mat_VarReadNextInfo(3)

Info

April 21, 2011