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//------------------------------------------------------------------------------
// GB_mex_reduce_to_vector: c = accum(c,reduce_to_vector(A))
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2020, All Rights Reserved.
// http://suitesparse.com See GraphBLAS/Doc/License.txt for license.
//------------------------------------------------------------------------------
// Reduce a matrix to a vector: w<mask> = accum (w, reduce_to_vector (A))
// MATLAB interface to GrB_reduce, which relies on GrB_Matrix_reduce_BinaryOp
// and GrB_Matrix_reduce_Monoid to reduce a matrix to a vector.
#include "GB_mex.h"
#define USAGE "w = GB_mex_reduce_to_vector (w, mask, accum, reduce, A, desc)"
#define FREE_ALL \
{ \
GB_MATRIX_FREE (&A) ; \
GrB_Vector_free_(&w) ; \
GrB_Vector_free_(&mask) ; \
GrB_Descriptor_free_(&desc) ; \
if (!user_complex) \
{ \
GrB_Monoid_free_(&reduce) ; \
} \
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_Vector w = NULL ;
GrB_Vector mask = NULL ;
GrB_Descriptor desc = NULL ;
GrB_Monoid reduce = NULL ;
bool user_complex = false ;
// check inputs
GB_WHERE (USAGE) ;
if (nargout > 1 || nargin < 5 || nargin > 6)
{
mexErrMsgTxt ("Usage: " USAGE) ;
}
// get w (make a deep copy)
#define GET_DEEP_COPY \
w = GB_mx_mxArray_to_Vector (pargin [0], "w input", true, true) ;
#define FREE_DEEP_COPY GrB_Vector_free_(&w) ;
GET_DEEP_COPY ;
if (w == NULL)
{
FREE_ALL ;
mexErrMsgTxt ("w failed") ;
}
// get mask (shallow copy)
mask = GB_mx_mxArray_to_Vector (pargin [1], "mask", false, false) ;
if (mask == NULL && !mxIsEmpty (pargin [1]))
{
FREE_ALL ;
mexErrMsgTxt ("mask 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 reduce operator
user_complex = (Complex != GxB_FC64) && (A->type == Complex) ;
GrB_BinaryOp reduceop ;
if (!GB_mx_mxArray_to_BinaryOp (&reduceop, pargin [3], "reduceop",
w->type, user_complex) || reduceop == NULL)
{
FREE_ALL ;
mexErrMsgTxt ("reduceop failed") ;
}
// get the reduce monoid
if (user_complex)
{
if (reduceop == Complex_plus)
{
reduce = Complex_plus_monoid ;
}
else if (reduceop == Complex_times)
{
reduce = Complex_times_monoid ;
}
else
{
FREE_ALL ;
mexErrMsgTxt ("reduce failed") ;
}
}
else
{
// create the reduce monoid
if (!GB_mx_Monoid (&reduce, reduceop, malloc_debug))
{
FREE_ALL ;
mexErrMsgTxt ("reduce failed") ;
}
}
// get accum, if present
user_complex = (Complex != GxB_FC64) && (w->type == Complex) ;
GrB_BinaryOp accum ;
if (!GB_mx_mxArray_to_BinaryOp (&accum, pargin [2], "accum",
w->type, user_complex))
{
FREE_ALL ;
mexErrMsgTxt ("accum failed") ;
}
// get desc
if (!GB_mx_mxArray_to_Descriptor (&desc, PARGIN (5), "desc"))
{
FREE_ALL ;
mexErrMsgTxt ("desc failed") ;
}
// w<mask> = accum (w, reduce_to_vector (A))
METHOD (GrB_Matrix_reduce_Monoid_(w, mask, accum, reduce, A, desc)) ;
// return w to MATLAB as a struct and free the GraphBLAS w
pargout [0] = GB_mx_Vector_to_mxArray (&w, "w output", true) ;
FREE_ALL ;
}
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