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//------------------------------------------------------------------------------
// GB_mex_transpose: transpose a sparse matrix and return it to MATLAB
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2020, All Rights Reserved.
// http://suitesparse.com See GraphBLAS/Doc/License.txt for license.
//------------------------------------------------------------------------------
// C<M> = accum (C,A') or accum (C,A)
#include "GB_mex.h"
#define USAGE "C = GB_mex_transpose (C, M, accum, A, desc, test)"
#define FREE_ALL \
{ \
bool A_is_M = (A == M) ; \
bool A_is_C = (A == C) ; \
bool C_is_M = (C == M) ; \
GB_MATRIX_FREE (&A) ; \
if (A_is_C) C = NULL ; \
if (A_is_M) M = NULL ; \
GB_MATRIX_FREE (&C) ; \
if (C_is_M) M = NULL ; \
GB_MATRIX_FREE (&M) ; \
GrB_Descriptor_free_(&desc) ; \
GB_mx_put_global (true, 0) ; \
}
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
bool malloc_debug = GB_mx_get_global (true) ;
GrB_Matrix A = NULL ;
GrB_Matrix C = NULL ;
GrB_Matrix M = NULL ;
GrB_Descriptor desc = NULL ;
// check inputs
GB_WHERE (USAGE) ;
if (nargout > 1 || nargin < 4 || nargin > 6)
{
mexErrMsgTxt ("Usage: " USAGE) ;
}
// get M (shallow copy)
if (!mxIsChar (pargin [1]))
{
M = GB_mx_mxArray_to_Matrix (pargin [1], "M", false, false) ;
if (M == NULL && !mxIsEmpty (pargin [1]))
{
FREE_ALL ;
mexErrMsgTxt ("M failed") ;
}
}
// get A (shallow copy)
if (!mxIsChar (pargin [3]))
{
A = GB_mx_mxArray_to_Matrix (pargin [3], "A input", false, true) ;
if (A == NULL)
{
FREE_ALL ;
mexErrMsgTxt ("A failed") ;
}
}
// get C (make a deep copy) and get any aliases for M and A
#define GET_DEEP_COPY \
{ \
C = GB_mx_mxArray_to_Matrix (pargin [0], "C input", true, true) ; \
if (nargin > 5 && C != NULL) \
{ \
C->nvec_nonempty = -1 ; /* for testing */ \
} \
if (mxIsChar (pargin [1])) \
{ \
M = GB_mx_alias ("M", pargin [1], "C", C, "A", A) ; \
} \
if (mxIsChar (pargin [3])) \
{ \
A = GB_mx_alias ("A", pargin [3], "C", C, "M", M) ; \
} \
}
#define FREE_DEEP_COPY \
{ \
if (A == C) A = NULL ; \
if (M == C) M = NULL ; \
GB_MATRIX_FREE (&C) ; \
}
GET_DEEP_COPY ;
if (C == NULL)
{
FREE_ALL ;
mexErrMsgTxt ("C failed") ;
}
// get accum; default: NOP, default is C->type
bool user_complex = (Complex != GxB_FC64)
&& (C->type == Complex || A->type == Complex) ;
GrB_BinaryOp accum ;
if (!GB_mx_mxArray_to_BinaryOp (&accum, pargin [2], "accum",
C->type, user_complex))
{
FREE_ALL ;
mexErrMsgTxt ("accum failed") ;
}
// get desc
if (!GB_mx_mxArray_to_Descriptor (&desc, PARGIN (4), "desc"))
{
FREE_ALL ;
mexErrMsgTxt ("desc failed") ;
}
// just for testing
if (nargin > 5)
{
if (M != NULL) M->nvec_nonempty = -1 ;
A->nvec_nonempty = -1 ;
C->nvec_nonempty = -1 ;
}
// C<M> = op(C,A') or op(C,A)
METHOD (GrB_transpose (C, M, accum, A, desc)) ;
// return C to MATLAB as a struct and free the GraphBLAS C
if (C == A) A = NULL ; // do not free A if it is aliased to C
if (C == M) M = NULL ; // do not free M if it is aliased to C
pargout [0] = GB_mx_Matrix_to_mxArray (&C, "C output", true) ;
// C is now NULL
FREE_ALL ;
}
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