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MAT_VARCREATESTRUCT(3) Library Functions Manual MAT_VARCREATESTRUCT(3) NAME Mat_VarCreateStruct -- Creates a structure variable. SYNOPSIS #include <matio.h> matvar_t * Mat_VarCreateStruct(const char *name, int rank, const size_t *dims, const char **fields, unsigned nfields); DESCRIPTION The Mat_VarCreateStruct() function creates a structure variable named 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 vari- able pointer should be free'd when no longer needed using Mat_VarFree(). 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 %s0, 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_VarCreate(3), Mat_VarSetStructFieldByName(3) FreeBSD Ports 14.quarterly November 20, 2023 MAT_VARCREATESTRUCT(3)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | EXAMPLES | SEE ALSO
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