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//------------------------------------------------------------------------------
// gbextract: extract entries into a GraphBLAS matrix
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// gbextract is an interface to GrB_Matrix_extract and
// GrB_Matrix_extract_[TYPE], computing the GraphBLAS expression:
// C<#M,replace> = accum (C, A (I,J)) or
// C<#M,replace> = accum (C, AT (I,J))
// Usage:
// C = gbextract (Cin, M, accum, A, I, J, desc)
// A is required. See GrB.m for more details.
// If accum or M is used, then Cin must appear.
#include "gb_interface.h"
#include "GB_ij.h"
#define USAGE "usage: C = GrB.extract (Cin, M, accum, A, I, J, desc)"
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
gb_usage (nargin >= 1 && nargin <= 7 && nargout <= 2, USAGE) ;
//--------------------------------------------------------------------------
// find the arguments
//--------------------------------------------------------------------------
mxArray *Matrix [6], *String [2], *Cell [2] ;
base_enum_t base ;
kind_enum_t kind ;
GxB_Format_Value fmt ;
int nmatrices, nstrings, ncells, sparsity ;
GrB_Descriptor desc ;
gb_get_mxargs (nargin, pargin, USAGE, Matrix, &nmatrices, String, &nstrings,
Cell, &ncells, &desc, &base, &kind, &fmt, &sparsity) ;
CHECK_ERROR (nmatrices < 1 || nmatrices > 3 || nstrings > 1, USAGE) ;
//--------------------------------------------------------------------------
// get the matrices
//--------------------------------------------------------------------------
GrB_Type atype, ctype = NULL ;
GrB_Matrix C = NULL, M = NULL, A ;
if (nmatrices == 1)
{
A = gb_get_shallow (Matrix [0]) ;
}
else if (nmatrices == 2)
{
C = gb_get_deep (Matrix [0]) ;
A = gb_get_shallow (Matrix [1]) ;
}
else // if (nmatrices == 3)
{
C = gb_get_deep (Matrix [0]) ;
M = gb_get_shallow (Matrix [1]) ;
A = gb_get_shallow (Matrix [2]) ;
}
OK (GxB_Matrix_type (&atype, A)) ;
if (C != NULL)
{
OK (GxB_Matrix_type (&ctype, C)) ;
}
//--------------------------------------------------------------------------
// get the operator
//--------------------------------------------------------------------------
GrB_BinaryOp accum = NULL ;
if (nstrings == 1)
{
// if accum appears, then Cin must also appear
CHECK_ERROR (C == NULL, USAGE) ;
accum = gb_mxstring_to_binop (String [0], ctype, ctype) ;
}
//--------------------------------------------------------------------------
// get the size of A
//--------------------------------------------------------------------------
GrB_Desc_Value in0 ;
OK (GxB_Desc_get (desc, GrB_INP0, &in0)) ;
GrB_Index anrows, ancols ;
bool A_transpose = (in0 == GrB_TRAN) ;
if (A_transpose)
{
// T = AT (I,J) is to be extracted where AT = A'
OK (GrB_Matrix_nrows (&ancols, A)) ;
OK (GrB_Matrix_ncols (&anrows, A)) ;
}
else
{
// T = A (I,J) is to be extracted
OK (GrB_Matrix_nrows (&anrows, A)) ;
OK (GrB_Matrix_ncols (&ancols, A)) ;
}
//--------------------------------------------------------------------------
// get I and J
//--------------------------------------------------------------------------
GrB_Index *I = (GrB_Index *) GrB_ALL ;
GrB_Index *J = (GrB_Index *) GrB_ALL ;
GrB_Index ni = anrows, nj = ancols ;
bool I_allocated = false, J_allocated = false ;
if (anrows == 1 && ncells == 1)
{
// only J is present
J = gb_mxcell_to_index (Cell [0], base, ancols, &J_allocated, &nj,
NULL) ;
}
else if (ncells == 1)
{
// only I is present
I = gb_mxcell_to_index (Cell [0], base, anrows, &I_allocated, &ni,
NULL) ;
}
else if (ncells == 2)
{
// both I and J are present
I = gb_mxcell_to_index (Cell [0], base, anrows, &I_allocated, &ni,
NULL) ;
J = gb_mxcell_to_index (Cell [1], base, ancols, &J_allocated, &nj,
NULL) ;
}
//--------------------------------------------------------------------------
// construct C if not present on input
//--------------------------------------------------------------------------
if (C == NULL)
{
// Cin is not present: determine its size, same type as A.
// T = A(I,J) or AT(I,J) will be extracted.
// accum must be null
int I_kind, J_kind ;
int64_t I_colon [3], J_colon [3] ;
GrB_Index cnrows, cncols ;
GB_ijlength (I, ni, anrows, (int64_t *) &cnrows, &I_kind, I_colon) ;
GB_ijlength (J, nj, ancols, (int64_t *) &cncols, &J_kind, J_colon) ;
ctype = atype ;
// create the matrix C and set its format and sparsity
fmt = gb_get_format (cnrows, cncols, A, NULL, fmt) ;
sparsity = gb_get_sparsity (A, NULL, sparsity) ;
C = gb_new (ctype, cnrows, cncols, fmt, sparsity) ;
}
//--------------------------------------------------------------------------
// compute C<M> += A(I,J) or AT(I,J)
//--------------------------------------------------------------------------
OK1 (C, GrB_Matrix_extract (C, M, accum, A, I, ni, J, nj, desc)) ;
//--------------------------------------------------------------------------
// free shallow copies
//--------------------------------------------------------------------------
OK (GrB_Matrix_free (&M)) ;
OK (GrB_Matrix_free (&A)) ;
OK (GrB_Descriptor_free (&desc)) ;
if (I_allocated) gb_mxfree ((void **) (&I)) ;
if (J_allocated) gb_mxfree ((void **) (&J)) ;
//--------------------------------------------------------------------------
// export the output matrix C
//--------------------------------------------------------------------------
pargout [0] = gb_export (&C, kind) ;
pargout [1] = mxCreateDoubleScalar (kind) ;
GB_WRAPUP ;
}
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