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//------------------------------------------------------------------------------
// GB_mex_reduce_bool: c = accum(c,reduce_to_scalar(A)) for boolean
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// Reduce a boolean matrix or vector to a boolean.
#include "GB_mex.h"
#define USAGE "result = GB_mex_reduce_bool (A, op, identity, terminal)"
#define FREE_ALL \
{ \
GrB_Matrix_free_(&A) ; \
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_Info info ;
GrB_Matrix A = NULL ;
GrB_Monoid reduce = NULL ;
GrB_BinaryOp reduceop = NULL ;
// check inputs
if (nargout > 1 || nargin < 3 || nargin > 4)
{
mexErrMsgTxt ("Usage: " USAGE) ;
}
#define GET_DEEP_COPY ;
#define FREE_DEEP_COPY ;
// get A (shallow copy)
A = GB_mx_mxArray_to_Matrix (pargin [0], "A input", false, true) ;
if (A == NULL)
{
FREE_ALL ;
mexErrMsgTxt ("A failed") ;
}
if (A->type != GrB_BOOL)
{
FREE_ALL ;
mexErrMsgTxt ("A must be boolean") ;
}
// get the op (always boolean)
if (!GB_mx_mxArray_to_BinaryOp (&reduceop, pargin [1], "reduceop",
GrB_BOOL, false) || reduceop == NULL)
{
FREE_ALL ;
mexErrMsgTxt ("reduceop failed") ;
}
// get the boolean identity value
bool GET_SCALAR (2, bool, identity, true) ;
// get the boolean terminal value, if any. default is true
bool terminal = true ;
bool has_terminal = (nargin == 4) ;
if (has_terminal)
{
GET_SCALAR (3, bool, terminal, true) ;
}
// create the reduce monoid
if (has_terminal)
{
info = GxB_Monoid_terminal_new_BOOL_(&reduce, reduceop, identity, terminal) ;
}
else
{
info = GrB_Monoid_new_BOOL_(&reduce, reduceop, identity) ;
}
if (info != GrB_SUCCESS)
{
FREE_ALL ;
mexErrMsgTxt ("monoid failed") ;
}
// reduce to a scalar
bool result = false ;
info = GrB_Matrix_reduce_BOOL_(&result, NULL, reduce, A, NULL) ;
if (info != GrB_SUCCESS)
{
FREE_ALL ;
mexErrMsgTxt ("GrB_reduce failed") ;
}
// return result as a boolean scalar
pargout [0] = GB_mx_create_full (1, 1, GrB_BOOL) ;
GB_void *p = mxGetData (pargout [0]) ;
memcpy (p, &result, sizeof (bool)) ;
FREE_ALL ;
}
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