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//------------------------------------------------------------------------------
// GB_mex_test17: reduce to vector with user-data type
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
#include "GB_mex.h"
#include "GB_mex_errors.h"
#define FREE_ALL ;
#define GET_DEEP_COPY ;
#define FREE_DEEP_COPY ;
typedef struct { int32_t re ; int32_t im ; } mygauss ;
#define MYGAUSS_DEFN \
"typedef struct { int32_t re ; int32_t im ; } mygauss ;"
void myadd (mygauss *z, const mygauss *x, const mygauss *y) ;
void myadd (mygauss *z, const mygauss *x, const mygauss *y)
{
z->re = x->re + y->re ;
z->im = x->im + y->im ;
}
#define MYADD_DEFN \
"void myadd (mygauss *z, const mygauss *x, const mygauss *y) \n" \
"{ \n" \
" z->re = x->re + y->re ; \n" \
" z->im = x->im + y->im ; \n" \
"}"
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
//--------------------------------------------------------------------------
// startup GraphBLAS
//--------------------------------------------------------------------------
GrB_Info info ;
bool malloc_debug = GB_mx_get_global (true) ;
OK (GxB_set (GxB_BURBLE, true)) ;
//--------------------------------------------------------------------------
// create the Gauss type and Add operator and monoid
//--------------------------------------------------------------------------
GrB_Type Gauss = NULL ;
OK (GxB_Type_new (&Gauss, sizeof (mygauss), "mygauss", MYGAUSS_DEFN)) ;
OK (GxB_print (Gauss, 3)) ;
GrB_BinaryOp MyAdd = NULL ;
OK (GxB_BinaryOp_new (&MyAdd, (GxB_binary_function) myadd,
Gauss, Gauss, Gauss, "myadd", MYADD_DEFN)) ;
OK (GxB_print (MyAdd, 3)) ;
mygauss zero ;
zero.re = 0 ;
zero.im = 0 ;
GrB_Monoid Monoid = NULL ;
OK (GrB_Monoid_new_UDT (&Monoid, MyAdd, (void *) &zero)) ;
OK (GxB_print (Monoid, 3)) ;
//--------------------------------------------------------------------------
// create a Gauss matrix and reduce it to a vector
//--------------------------------------------------------------------------
int n = 4 ;
GrB_Matrix A = NULL ;
GrB_Vector v = NULL ;
OK (GrB_Matrix_new (&A, Gauss, n, n)) ;
OK (GrB_Vector_new (&v, Gauss, n)) ;
mygauss z ;
int k = 1 ;
for (int i = 0 ; i < n ; i++)
{
for (int j = i ; j < n ; j++)
{
z.re = k++ ;
z.im = (i-j) ;
OK (GrB_Matrix_setElement_UDT (A, (void *) &z, i, j)) ;
printf ("A (%d, %d) = (%d, %d)\n", i, j, z.re, z.im) ;
}
}
OK (GrB_wait (A, GrB_MATERIALIZE)) ;
OK (GxB_print (A, 3)) ;
#undef GET_DEEP_COPY
#define GET_DEEP_COPY GrB_Vector_new (&v, Gauss, n) ;
#undef FREE_DEEP_COPY
#define FREE_DEEP_COPY GrB_free (&v) ;
METHOD (GrB_reduce (v, NULL, NULL, Monoid, A, NULL)) ;
OK (GxB_print (v, 3)) ;
printf ("\nvector v:\n") ;
for (int i = 0 ; i < n ; i++)
{
mygauss t ;
info = GrB_Vector_extractElement_UDT ((void *) &t, v, i) ;
printf ("v (%d) ", i) ;
if (info == GrB_NO_VALUE)
{
printf (" not present\n") ;
}
else
{
printf (" = (%d,%d)\n", t.re, t.im) ;
}
switch (i)
{
case 0: CHECK (t.re == 10 && t.im == -6) ; break ;
case 1: CHECK (t.re == 18 && t.im == -3) ; break ;
case 2: CHECK (t.re == 17 && t.im == -1) ; break ;
case 3: CHECK (t.re == 10 && t.im == 0) ; break ;
default:;
}
}
z.re = 2 ;
z.im = 0 ;
GrB_free (&A) ;
OK (GrB_Matrix_new (&A, Gauss, n, n)) ;
OK (GrB_assign (A, NULL, NULL, (void *) &z, GrB_ALL, n, GrB_ALL, n, NULL)) ;
OK (GxB_print (A, 3)) ;
METHOD (GrB_reduce (v, NULL, NULL, Monoid, A, NULL)) ;
OK (GxB_print (v, 3)) ;
for (int i = 0 ; i < n ; i++)
{
mygauss t ;
t.re = -999 ;
t.im = -999 ;
info = GrB_Vector_extractElement_UDT ((void *) &t, v, i) ;
printf ("v (%d) ", i) ;
if (info == GrB_NO_VALUE)
{
printf (" not present\n") ;
}
else
{
printf (" = (%d,%d)\n", t.re, t.im) ;
}
CHECK (t.re == 8 && t.im == 0) ;
}
//--------------------------------------------------------------------------
// finalize GraphBLAS
//--------------------------------------------------------------------------
GrB_free (&Gauss) ;
GrB_free (&MyAdd) ;
GrB_free (&Monoid) ;
GrB_free (&A) ;
GrB_free (&v) ;
OK (GxB_set (GxB_BURBLE, false)) ;
GB_mx_put_global (true) ;
printf ("\nGB_mex_test17: all tests passed\n\n") ;
}
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