trusty (3) Mat_Rewind.3.gz

NAME

     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)