Mat_VarCreateStruct (3) Linux Manual Page

Mat_VarCreateStruct – Creates a structure variable.

Synopsis

Fd #include <matio.h> Ft matvar_t * Fo Mat_VarCreateStruct Fa const char *name Fa int rank Fa size_t *dims Fa const char **fields Fa unsigned nfields Fc

Description

The Fn Mat_VarCreateStruct function creates a structure variable named Fa name that can be written to a MAT file.

Return Values

If the structure variable was successfully created, a pointer to the variable is returned. Otherwise NULL is returned. The structure variable pointer should be free’d when no longer needed using Mat_VarFree3 . The names of the fields are copied in the function, and thus should be released after calling the function if necessary.

Examples

This example program opens a MAT file named by the first argument to the program, and writes a structure named a to the file.

#include "matio.h"

int

main(int argc,char **argv)

{

 mat_t *matfp;

 matvar_t *matvar;

 matvar_t *field;

 const char *fields[2] = {"field1","field2"};

 double data1 = 1, data2 = 2;

 size_t dims[2] = {1, 1};

 matfp = Mat_Open(argv[1],MAT_ACC_RDWR);

 if ( NULL == matfp ) {

 fprintf(stderr,"Error opening MAT file %s,argv[1]);

 return EXIT_FAILURE;

 }

 dims[0] = 1; dims[1] = 1;

 matvar = Mat_VarCreateStruct("a",2,dims,fields,2);

 if ( NULL == matvar ) {

 Mat_Close(matfp);

 return EXIT_FAILURE;

 }

 field = Mat_VarCreate(NULL,MAT_C_DOUBLE,MAT_T_DOUBLE,2,dims,&data1,

 MAT_F_DONT_COPY_DATA);

 Mat_VarSetStructFieldByName(matvar, "field1", 0, field);

 field = Mat_VarCreate(NULL,MAT_C_DOUBLE,MAT_T_DOUBLE,2,dims,&data2,

 MAT_F_DONT_COPY_DATA);

 Mat_VarSetStructFieldByName(matvar, "field2", 0, field);

 Mat_VarWrite(matfp,matvar,MAT_COMPRESSION_NONE);

 Mat_VarFree(matvar);

 Mat_Close(matfp);

 return EXIT_SUCCESS;

}

See Also

Mat_VarCreate3, Mat_VarSetStructFieldByName3