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//------------------------------------------------------------------------------
// GB_mex_reduce_to_scalar: c = accum(c,reduce_to_scalar(A))
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// Reduce a matrix or vector to a scalar
#include "GB_mex.h"
#define USAGE "c = GB_mex_reduce_to_scalar (c, accum, reduce, A)"
#define FREE_ALL \
{ \
GrB_Matrix_free_(&A) ; \
if (reduce_monoid_allocated) \
{ \
GrB_Monoid_free_(&reduce) ; \
} \
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 ;
GrB_Monoid reduce = NULL ;
bool reduce_is_complex = false ;
bool reduce_monoid_allocated = false ;
// check inputs
if (nargout > 1 || nargin != 4)
{
mexErrMsgTxt ("Usage: " USAGE) ;
}
#define GET_DEEP_COPY ;
#define FREE_DEEP_COPY ;
// get the scalar c
GB_void *c ;
int64_t cnrows, cncols ;
GrB_Type ctype ;
GB_mx_mxArray_to_array (pargin [0], &c, &cnrows, &cncols, &ctype) ;
if (cnrows != 1 || cncols != 1)
{
mexErrMsgTxt ("c must be a scalar") ;
}
if (ctype == NULL)
{
mexErrMsgTxt ("c must be numeric") ;
}
// get A (shallow copy)
A = GB_mx_mxArray_to_Matrix (pargin [3], "A input", false, true) ;
if (A == NULL)
{
FREE_ALL ;
mexErrMsgTxt ("A failed") ;
}
// get reduce
bool user_complex = (Complex != GxB_FC64) && (ctype == Complex) ;
GrB_BinaryOp reduceop ;
if (!GB_mx_mxArray_to_BinaryOp (&reduceop, pargin [2], "reduceop",
ctype, 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") ;
}
reduce_monoid_allocated = true ;
}
// get accum, if present
GrB_BinaryOp accum ;
if (!GB_mx_mxArray_to_BinaryOp (&accum, pargin [1], "accum",
ctype, user_complex))
{
FREE_ALL ;
mexErrMsgTxt ("accum failed") ;
}
// c = accum(C,A*B)
// test both Vector and Matrix methods. The typecast is not necessary,
// just to test.
if (user_complex)
{
if (A->vdim == 1)
{
GrB_Vector V ;
V = (GrB_Vector) A ;
METHOD (GrB_Vector_reduce_UDT (c, accum, reduce, V, NULL)) ;
}
else
{
METHOD (GrB_Matrix_reduce_UDT (c, accum, reduce, A, NULL)) ;
}
}
else
{
#define REDUCE(prefix,suffix,type) \
if (A->vdim == 1) \
{ \
GrB_Vector V ; \
V = (GrB_Vector) A ; \
METHOD (prefix ## Vector_reduce ## suffix \
((type *) c, accum, reduce, V, NULL)) ; \
} \
else \
{ \
METHOD (prefix ## Matrix_reduce ## suffix \
((type *) c, accum, reduce, A, NULL)) ; \
}
switch (ctype->code)
{
case GB_BOOL_code : REDUCE (GrB_, _BOOL, bool ) ; break ;
case GB_INT8_code : REDUCE (GrB_, _INT8, int8_t ) ; break ;
case GB_INT16_code : REDUCE (GrB_, _INT16, int16_t ) ; break ;
case GB_INT32_code : REDUCE (GrB_, _INT32, int32_t ) ; break ;
case GB_INT64_code : REDUCE (GrB_, _INT64, int64_t ) ; break ;
case GB_UINT8_code : REDUCE (GrB_, _UINT8, uint8_t ) ; break ;
case GB_UINT16_code : REDUCE (GrB_, _UINT16, uint16_t) ; break ;
case GB_UINT32_code : REDUCE (GrB_, _UINT32, uint32_t) ; break ;
case GB_UINT64_code : REDUCE (GrB_, _UINT64, uint64_t) ; break ;
case GB_FP32_code : REDUCE (GrB_, _FP32, float ) ; break ;
case GB_FP64_code : REDUCE (GrB_, _FP64, double ) ; break ;
case GB_FC32_code : REDUCE (GxB_, _FC32, GxB_FC32_t) ; break ;
case GB_FC64_code : REDUCE (GxB_, _FC64, GxB_FC64_t) ; break ;
default :
FREE_ALL ;
mexErrMsgTxt ("unknown type: reduce to scalar") ;
}
}
// return C as a scalar
pargout [0] = GB_mx_create_full (1, 1, ctype) ;
GB_void *p = mxGetData (pargout [0]) ;
memcpy (p, c, ctype->size) ;
FREE_ALL ;
}
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