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//------------------------------------------------------------------------------
// GB_mex_dot_iterator: s = X'*Y, dot product of 2 vectors using iterators
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// X and Y must have the same type. If boolean, the lor_land semiring is used.
// Otherwise, the plus_times semiring is used for the given type.
#include "GB_mex.h"
#include "GB_mex_errors.h"
#define USAGE "s = GB_mex_dot_iterator (X, Y, kind)"
#define FREE_ALL \
{ \
GrB_Vector_free_(&X) ; \
GrB_Vector_free_(&Y) ; \
GxB_Iterator_free (&X_iterator) ; \
GxB_Iterator_free (&Y_iterator) ; \
GB_mx_put_global (true) ; \
}
#define Assert(x) \
{ \
if (!(x)) \
{ \
printf ("Failure at %d\n", __LINE__) ; \
mexErrMsgTxt ("fail") ; \
} \
}
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
GrB_Info info ;
bool malloc_debug = GB_mx_get_global (true) ;
GrB_Vector Y = NULL, X = NULL ;
GrB_Matrix A = NULL ;
GxB_Iterator X_iterator = NULL, Y_iterator ;
// check inputs
if (nargout > 1 || nargin < 2 || nargin > 3)
{
mexErrMsgTxt ("Usage: " USAGE) ;
}
// get X (shallow copy)
X = GB_mx_mxArray_to_Vector (pargin [0], "X input", false, true) ;
if (X == NULL)
{
FREE_ALL ;
mexErrMsgTxt ("X failed") ;
}
// get Y (shallow copy)
Y = GB_mx_mxArray_to_Vector (pargin [1], "Y input", false, true) ;
if (Y == NULL)
{
FREE_ALL ;
mexErrMsgTxt ("Y failed") ;
}
// get kind:
// 0: merge, using macros
// 1: iterate through x and lookup y, using macros
// 2: merge, using functions
// 3: iterate through x and lookup y, using functions
int GET_SCALAR (2, int, kind, 0) ;
bool use_macros = (kind <= 1) ;
kind = kind % 2 ;
GrB_Index n, ny ;
OK (GrB_Vector_size (&n, X)) ;
OK (GrB_Vector_size (&ny, Y)) ;
GB_Global_print_one_based_set (0) ;
if (n != ny)
{
FREE_ALL ;
mexErrMsgTxt ("X and Y must have the same size") ;
}
GrB_Type type = X->type ;
if (type != Y->type)
{
FREE_ALL ;
mexErrMsgTxt ("X and Y must have the same type") ;
}
// bool user_complex = (Complex != GxB_FC64) && (type == Complex) ;
// create the output scalar and set it to zero
pargout [0] = GB_mx_create_full (1, 1, type) ;
GB_void *s = mxGetData (pargout [0]) ;
memset (s, 0, type->size) ;
//--------------------------------------------------------------------------
// s += X'*Y using vector iterators
//--------------------------------------------------------------------------
// create the X and Y iterators
OK (GxB_Iterator_new (&X_iterator)) ;
OK (GxB_Iterator_new (&Y_iterator)) ;
GrB_Info X_info = GxB_Vector_Iterator_attach (X_iterator, X, NULL) ;
GrB_Info Y_info = GxB_Vector_Iterator_attach (Y_iterator, Y, NULL) ;
OK (X_info) ;
OK (Y_info) ;
int x_sparsity, y_sparsity ;
OK (GxB_Vector_Option_get (X, GxB_SPARSITY_STATUS, &x_sparsity)) ;
OK (GxB_Vector_Option_get (Y, GxB_SPARSITY_STATUS, &y_sparsity)) ;
GrB_Index xnvals, ynvals ;
OK (GrB_Vector_nvals (&xnvals, X)) ;
OK (GrB_Vector_nvals (&ynvals, Y)) ;
// if (kind == 0) { GxB_print (X, 3) ; GxB_print (Y, 3) ; }
if (X->b != NULL && X->type == GrB_FP64)
{
// mangle the X vector where entries are not present
double *Xx = (double *) X->x ;
int8_t *Xb = X->b ;
int64_t n = X->vlen ;
for (int64_t k = 0 ; k < n ; k++)
{
if (!Xb [k]) Xx [k] = 42 ;
}
}
if (Y->b != NULL && Y->type == GrB_FP64)
{
// mangle the Y vector where entries are not present
double *Yx = (double *) Y->x ;
int8_t *Yb = Y->b ;
int64_t n = Y->vlen ;
for (int64_t k = 0 ; k < n ; k++)
{
if (!Yb [k]) Yx [k] = 42 ;
}
}
if (use_macros)
{
// use macros that are #define'd in GraphBLAS.h
#include "Template/GB_mx_dot_iterator_template.c"
}
else
{
// use functions whose prototypes are in GraphBLAS.h
#include "GB_undef_iterator.h"
#include "Template/GB_mx_dot_iterator_template.c"
}
//--------------------------------------------------------------------------
// free workspace
//--------------------------------------------------------------------------
GB_Global_print_one_based_set (1) ;
FREE_ALL ;
}
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