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//------------------------------------------------------------------------------
// GB_mex_dup: copy a matrix
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// copy and typecast a matrix
#include "GB_mex.h"
#include "GB_mex_errors.h"
#define USAGE "C = GB_mex_dup (A, type, method, sparsity)"
#define FREE_ALL \
{ \
GrB_Matrix_free_(&A) ; \
GrB_Matrix_free_(&C) ; \
GrB_Descriptor_free_(&desc) ; \
GB_mx_put_global (true) ; \
}
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
bool malloc_debug = GB_mx_get_global (true) ;
GrB_Matrix A = NULL, C = NULL ;
GrB_Descriptor desc = NULL ;
// check inputs
if (nargout > 1 || nargin < 1 || nargin > 4)
{
mexErrMsgTxt ("Usage: " USAGE) ;
}
#define GET_DEEP_COPY ;
#define FREE_DEEP_COPY ;
A = GB_mx_mxArray_to_Matrix (pargin [0], "A input", false, true) ;
GrB_Matrix_set_String (A, "A input", GrB_NAME) ;
// get ctype of output matrix
GrB_Type ctype = GB_mx_string_to_Type (PARGIN (1), A->type) ;
bool is_csc = A->is_csc ;
// get method
int GET_SCALAR (2, int, method, 0) ;
// get sparsity
int GET_SCALAR (3, int, sparsity, GxB_DEFAULT) ;
if (ctype == A->type)
{
// copy C with the same type as A, with default sparsity
if (method == 0 && sparsity == GxB_DEFAULT)
{
METHOD (GrB_Matrix_dup (&C, A)) ;
// get the name of the C matrix
char name [256] ;
GrB_Matrix_get_String (C, name, GrB_NAME) ;
CHECK (MATCH (name, "A input")) ;
}
else
{
// try another method, just for testing (see User Guide)
// C = create an exact copy of A, just like GrB_Matrix_dup
GrB_Type type ;
uint64_t nrows, ncols ;
#undef GET_DEEP_COPY
#undef FREE_DEEP_COPY
#define GET_DEEP_COPY \
{ \
GxB_Matrix_type (&type, A) ; \
GrB_Matrix_nrows (&nrows, A) ; \
GrB_Matrix_ncols (&ncols, A) ; \
GrB_Matrix_new (&C, type, nrows, ncols) ; \
GrB_Descriptor_new (&desc) ; \
if (sparsity != GxB_DEFAULT) \
{ \
GxB_Matrix_Option_set (C, GxB_SPARSITY_CONTROL, sparsity) ;\
} \
GxB_Desc_set (desc, GrB_INP0, GrB_TRAN) ; \
}
#define FREE_DEEP_COPY \
{ \
GrB_Matrix_free_(&C) ; \
GrB_Descriptor_free_(&desc) ; \
}
GET_DEEP_COPY ;
if (method == 1)
{
// C = A using GrB_transpose with a desc.inp0 = transpose
METHOD (GrB_transpose (C, NULL, NULL, A, desc)) ;
}
else
{
// C = A using GrB_assign
METHOD (GrB_assign (C, NULL, NULL, A,
GrB_ALL, nrows, GrB_ALL, ncols, NULL)) ;
}
#undef GET_DEEP_COPY
#undef FREE_DEEP_COPY
}
}
else
{
// typecast
if (A->type == Complex && Complex != GxB_FC64)
{
A->type = GxB_FC64 ;
}
// C = (ctype) A
uint64_t nrows, ncols ;
#define GET_DEEP_COPY \
{ \
GrB_Matrix_nrows (&nrows, A) ; \
GrB_Matrix_ncols (&ncols, A) ; \
GrB_Matrix_new (&C, ctype, nrows, ncols) ; \
GrB_Descriptor_new (&desc) ; \
if (sparsity != GxB_DEFAULT) \
{ \
GxB_Matrix_Option_set (C, GxB_SPARSITY_CONTROL, sparsity) ; \
} \
GxB_Desc_set (desc, GrB_INP0, GrB_TRAN) ; \
}
#define FREE_DEEP_COPY \
{ \
GrB_Matrix_free_(&C) ; \
GrB_Descriptor_free_(&desc) ; \
}
GET_DEEP_COPY ;
if (method == 1)
{
// C = A using GrB_transpose with a desc.inp0 = transpose
METHOD (GrB_transpose (C, NULL, NULL, A, desc)) ;
}
else
{
// C = A using GrB_assign
METHOD (GrB_assign (C, NULL, NULL, A,
GrB_ALL, nrows, GrB_ALL, ncols, NULL)) ;
}
#undef GET_DEEP_COPY
#undef FREE_DEEP_COPY
}
// ensure C has the same csc property as A
GrB_Matrix_set_INT32 (C, is_csc ? GrB_COLMAJOR : GrB_ROWMAJOR,
GrB_STORAGE_ORIENTATION_HINT) ;
// return C as a struct and free the GraphBLAS C
pargout [0] = GB_mx_Matrix_to_mxArray (&C, "C output", true) ;
FREE_ALL ;
}
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