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//------------------------------------------------------------------------------
// GB_mex_select: C<M> = accum(C,select(A,k)) or select(A',k)
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// Apply a select operator to a matrix
#include "GB_mex.h"
#define USAGE "C = GB_mex_select (C, M, accum, op, A, Thunk, desc, test)"
#define FREE_ALL \
{ \
GrB_Scalar_free_(&Thunk) ; \
GrB_Matrix_free_(&C) ; \
GrB_Matrix_free_(&M) ; \
GrB_Matrix_free_(&A) ; \
GxB_SelectOp_free_(&isnanop) ; \
GrB_Descriptor_free_(&desc) ; \
GB_mx_put_global (true) ; \
}
bool isnan64 (GrB_Index i, GrB_Index j, const void *x, const void *b) ;
bool isnan64 (GrB_Index i, GrB_Index j, const void *x, const void *b)
{
double aij = * ((double *) x) ;
return (isnan (aij)) ;
}
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
bool malloc_debug = GB_mx_get_global (true) ;
GrB_Matrix C = NULL ;
GrB_Matrix M = NULL ;
GrB_Matrix A = NULL ;
GrB_Descriptor desc = NULL ;
GrB_Scalar Thunk = NULL ;
GxB_SelectOp isnanop = NULL ;
// check inputs
if (nargout > 1 || nargin < 5 || nargin > 8)
{
mexErrMsgTxt ("Usage: " USAGE) ;
}
// get C (make a deep copy)
#define GET_DEEP_COPY \
C = GB_mx_mxArray_to_Matrix (pargin [0], "C input", true, true) ; \
if (nargin > 7 && C != NULL) C->nvec_nonempty = -1 ;
#define FREE_DEEP_COPY GrB_Matrix_free_(&C) ;
GET_DEEP_COPY ;
if (C == NULL)
{
FREE_ALL ;
mexErrMsgTxt ("C failed") ;
}
// get M (shallow copy)
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)
A = GB_mx_mxArray_to_Matrix (pargin [4], "A input", false, true) ;
if (A == NULL)
{
FREE_ALL ;
mexErrMsgTxt ("A failed") ;
}
// get accum, if present
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 select operator; must be present
GxB_SelectOp op ;
if (!GB_mx_mxArray_to_SelectOp (&op, pargin [3], "op"))
{
FREE_ALL ;
mexErrMsgTxt ("SelectOp failed") ;
}
if (op == NULL)
{
// user-defined isnan operator, with no Thunk
GxB_SelectOp_new (&isnanop, isnan64, GrB_FP64, NULL) ;
op = isnanop ;
}
else if (nargin > 5)
{
// get Thunk (shallow copy)
if (mxIsSparse (pargin [5]))
{
Thunk = (GrB_Scalar) GB_mx_mxArray_to_Matrix (pargin [5],
"Thunk input", false, false) ;
if (Thunk == NULL)
{
FREE_ALL ;
mexErrMsgTxt ("Thunk failed") ;
}
if (!GB_SCALAR_OK (Thunk))
{
FREE_ALL ;
mexErrMsgTxt ("Thunk not a valid scalar") ;
}
}
else
{
// get k
Thunk = GB_mx_get_Scalar (pargin [5]) ;
}
}
// get desc
if (!GB_mx_mxArray_to_Descriptor (&desc, PARGIN (6), "desc"))
{
FREE_ALL ;
mexErrMsgTxt ("desc failed") ;
}
// just for testing
if (nargin > 7)
{
if (M != NULL) M->nvec_nonempty = -1 ;
A->nvec_nonempty = -1 ;
C->nvec_nonempty = -1 ;
}
// C<M> = accum(C,op(A))
if (C->vdim == 1 && (desc == NULL || desc->in0 == GxB_DEFAULT))
{
// this is just to test the Vector version
METHOD (GxB_Vector_select_((GrB_Vector) C, (GrB_Vector) M, accum, op,
(GrB_Vector) A, Thunk, desc)) ; // C
}
else
{
METHOD (GxB_Matrix_select_(C, M, accum, op, A, Thunk, desc)) ; // C
}
// 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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