MAT_REWIND(3) BSD Library Functions Manual MAT_REWIND(3)NAMEMat_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 ALSOMat_Open(3), Mat_Close(3), Mat_VarReadNext(3), Mat_VarReadNextInfo(3)BSD April 21, 2011 BSD
