1MAT_REWIND(3)            BSD Library Functions Manual            MAT_REWIND(3)
2

NAME

4     Mat_Rewind — Rewind an open .mat file to the beginning
5

SYNOPSIS

7     #include <matio.h>
8
9     int
10     Mat_Rewind(mat_t *matfp);
11

DESCRIPTION

13     Rewinds an open .mat file so that Mat_VarReadNext(3) or
14     Mat_VarReadNextInfo(3) reads the first variable in the file.
15

RETURN VALUES

17     The function returns 0 on success, or -1 on failure.
18

EXAMPLES

20     The following example shows a list of variables in the MAT file, and
21     prompts the user for the index of the variale to read. If the index is
22     valid, the file is reset to the beginning, and variables read until the
23     selected index is reached.
24
25     #include <stdlib.h>
26     #include <stdio.h>
27     #include "matio.h"
28
29     int
30     main(int argc,char **argv)
31     {
32         mat_t    *matfp;
33         matvar_t *matvar;
34         int       idx, num_variables;
35
36         matfp = Mat_Open(argv[1],MAT_ACC_RDONLY);
37         if ( NULL == matfp ) {
38             fprintf(stderr,"Error opening MAT file %s0,argv[1]);
39             return EXIT_FAILURE;
40         }
41
42         idx = 0;
43         while ( NULL != (matvar = Mat_VarReadNextInfo(matfp)) ) {
44             idx++;
45             printf("%3d. %s0,idx,matvar->name);
46             Mat_VarFree(matvar);
47         }
48         num_variables = idx;
49         if ( num_variables > 0 ) {
50             printf("Which variable would you like to read? ");
51             if ( 0 == fscanf(stdin,"%d",&idx) ) {
52                 printf("Invalid variable selection!0);
53             } else if ( idx < 1 || idx > num_variables ) {
54                 fprintf(stderr,"That is an invalid variable index!0);
55             } else {
56                 int k;
57                 Mat_Rewind(matfp);
58                 for ( k = 1; k < idx; k++ ) {
59                     matvar = Mat_VarReadNextInfo(matfp);
60                     Mat_VarFree(matvar);
61                 }
62                 matvar = Mat_VarReadNext(matfp);
63                 Mat_VarPrint(matvar,1);
64                 Mat_VarFree(matvar);
65             }
66         }
67
68         Mat_Close(matfp);
69         return EXIT_SUCCESS;
70     }
71

SEE ALSO

73     Mat_Open(3), Mat_Close(3), Mat_VarReadNext(3), Mat_VarReadNextInfo(3)
74
75BSD                             April 21, 2011                             BSD
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