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//------------------------------------------------------------------------------
// GB_mex_mxv_iterator: Y = A*X using an iterator
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// A and X 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 "Y = GB_mex_mxv_iterator (A, X, kind)"
#define FREE_ALL \
{ \
GrB_Vector_free_(&X) ; \
GrB_Vector_free_(&Y) ; \
GrB_Matrix_free_(&A) ; \
GxB_Iterator_free (&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 iterator = NULL ;
// check inputs
if (nargout > 1 || nargin < 2 || nargin > 3)
{
mexErrMsgTxt ("Usage: " USAGE) ;
}
// get A (shallow copy)
A = GB_mx_mxArray_to_Matrix (pargin [0], "A input", false, true) ;
if (A == NULL)
{
FREE_ALL ;
mexErrMsgTxt ("A failed") ;
}
GrB_Index nrows, ncols ;
OK (GrB_Matrix_nrows (&nrows, A)) ;
OK (GrB_Matrix_ncols (&ncols, A)) ;
GB_Global_print_one_based_set (0) ;
// get X (shallow copy)
X = GB_mx_mxArray_to_Vector (pargin [1], "X input", false, true) ;
if (X == NULL)
{
FREE_ALL ;
mexErrMsgTxt ("X failed") ;
}
// GxB_print (X, 3) ;
GrB_Index n ;
OK (GrB_Vector_size (&n, X)) ;
if (n != ncols)
{
FREE_ALL ;
mexErrMsgTxt ("X has the wrong size") ;
}
GrB_Type type = A->type ;
if (type != X->type)
{
FREE_ALL ;
mexErrMsgTxt ("A and X must have the same type") ;
}
// get kind
int GET_SCALAR (2, int, kind, 0) ;
bool use_macros = (kind <= 7) ;
kind = kind % 8 ;
// make sure X is full
int sparsity ;
OK (GxB_Vector_Option_get (X, GxB_SPARSITY_STATUS, &sparsity)) ;
if (sparsity != GxB_FULL)
{
FREE_ALL ;
mexErrMsgTxt ("X must be full") ;
}
bool user_complex = (Complex != GxB_FC64) && (type == Complex) ;
// create Y and make it full: all zero but non-iso
OK (GrB_Vector_new (&Y, type, nrows)) ;
if (user_complex)
{
double z [2] ;
z [0] = 0 ;
z [1] = 0 ;
OK (GrB_Vector_assign_UDT (Y, NULL, NULL, z, GrB_ALL, nrows, NULL)) ;
z [0] = 1 ;
OK (GrB_Vector_setElement_UDT (Y, z, 0)) ;
z [0] = 0 ;
OK (GrB_Vector_setElement_UDT (Y, z, 0)) ;
}
else
{
OK (GrB_Vector_assign_INT32 (Y, NULL, NULL, 0, GrB_ALL, nrows, NULL)) ;
OK (GrB_Vector_setElement_INT32 (Y, 1, 0)) ;
OK (GrB_Vector_setElement_INT32 (Y, 0, 0)) ;
}
OK (GrB_Vector_wait (Y, GrB_MATERIALIZE)) ;
//--------------------------------------------------------------------------
// Y += A*X using an iterator
//--------------------------------------------------------------------------
// create an iterator
OK (GxB_Iterator_new (&iterator)) ;
if (use_macros)
{
// use macros that are #define'd in GraphBLAS.h
#include "Template/GB_mx_mxv_iterator_template.c"
}
else
{
// use functions whose prototypes are in GraphBLAS.h
#include "GB_undef_iterator.h"
#include "Template/GB_mx_mxv_iterator_template.c"
}
//--------------------------------------------------------------------------
// error handling
//--------------------------------------------------------------------------
if (A->is_csc)
{
info = GxB_rowIterator_attach (iterator, A, NULL) ;
Assert (info == GrB_NOT_IMPLEMENTED) ;
}
else
{
info = GxB_colIterator_attach (iterator, A, NULL) ;
Assert (info == GrB_NOT_IMPLEMENTED) ;
}
//--------------------------------------------------------------------------
// return Y as a struct and free the GraphBLAS Y
//--------------------------------------------------------------------------
// GxB_print (Y, 3) ;
GB_Global_print_one_based_set (1) ;
pargout [0] = GB_mx_Vector_to_mxArray (&Y, "Y output", true) ;
FREE_ALL ;
}
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