NAME

     Mat_Rewind — Rewinds 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() or Mat_VarReadNextInfo() 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 variable 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), Mat_VarPrint(3)