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//------------------------------------------------------------------------------
// GB_mex_band: C = tril (triu (A,lo), hi), or with A'
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// Apply a select operator to a matrix
#include "GB_mex.h"
#define USAGE "C = GB_mex_band (A, lo, hi, atranspose)"
#define FREE_ALL \
{ \
GrB_Scalar_free_(&Thunk) ; \
GrB_Matrix_free_(&C) ; \
GrB_Matrix_free_(&A) ; \
GrB_Scalar_free_(&Thunk_type) ; \
GrB_IndexUnaryOp_free_(&op) ; \
GrB_Descriptor_free_(&desc) ; \
GB_mx_put_global (true) ; \
}
#define OK(method) \
{ \
info = method ; \
if (info != GrB_SUCCESS) \
{ \
FREE_ALL ; \
mexErrMsgTxt ("GraphBLAS failed") ; \
} \
}
typedef struct { int64_t lo ; int64_t hi ; } gb_LoHi_type ;
#define LOHI_DEFN \
"typedef struct { int64_t lo ; int64_t hi ; } gb_LoHi_type ;"
void gb_LoHi_band (bool *z, /* x is unused: */ const void *x,
uint64_t i, uint64_t j, const gb_LoHi_type *thunk) ;
void gb_LoHi_band (bool *z, /* x is unused: */ const void *x,
uint64_t i, uint64_t j, const gb_LoHi_type *thunk)
{
int64_t i2 = (int64_t) i ;
int64_t j2 = (int64_t) j ;
(*z) = ((thunk->lo <= (j2-i2)) && ((j2-i2) <= thunk->hi)) ;
}
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
bool malloc_debug = GB_mx_get_global (true) ;
GrB_Matrix C = NULL ;
GrB_Matrix A = NULL ;
GrB_IndexUnaryOp op = NULL ;
GrB_Info info ;
GrB_Descriptor desc = NULL ;
GrB_Scalar Thunk = NULL ;
GrB_Type Thunk_type = NULL ;
#define GET_DEEP_COPY ;
#define FREE_DEEP_COPY ;
// check inputs
if (nargout > 1 || nargin < 3 || nargin > 4)
{
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") ;
}
// create the Thunk
gb_LoHi_type bandwidth ;
OK (GxB_Type_new (&Thunk_type, sizeof (gb_LoHi_type),
"gb_LoHi_type", LOHI_DEFN)) ;
// get lo and hi
bandwidth.lo = (int64_t) mxGetScalar (pargin [1]) ;
bandwidth.hi = (int64_t) mxGetScalar (pargin [2]) ;
OK (GrB_Scalar_new (&Thunk, Thunk_type)) ;
OK (GrB_Scalar_setElement_UDT (Thunk, (void *) &bandwidth)) ;
OK (GrB_Scalar_wait_(Thunk, GrB_MATERIALIZE)) ;
// get atranspose
bool atranspose = false ;
if (nargin > 3) atranspose = (bool) mxGetScalar (pargin [3]) ;
if (atranspose)
{
OK (GrB_Descriptor_new (&desc)) ;
OK (GxB_Desc_set (desc, GrB_INP0, GrB_TRAN)) ;
}
// create operator
// use the user-defined operator, from the gb_LoHi_band function.
// This operator cannot be JIT'd because it doesn't have a name or defn.
METHOD (GrB_IndexUnaryOp_new (&op, (GxB_index_unary_function) gb_LoHi_band,
GrB_BOOL, GrB_FP64, Thunk_type)) ;
uint64_t nrows, ncols ;
GrB_Matrix_nrows (&nrows, A) ;
GrB_Matrix_ncols (&ncols, A) ;
if (bandwidth.lo == 0 && bandwidth.hi == 0 && nrows == 10 && ncols == 10)
{
GxB_IndexUnaryOp_fprint (op, "lohi_op", 3, NULL) ;
}
// create result matrix C
if (atranspose)
{
OK (GrB_Matrix_new (&C, GrB_FP64, A->vdim, A->vlen)) ;
}
else
{
OK (GrB_Matrix_new (&C, GrB_FP64, A->vlen, A->vdim)) ;
}
// C<Mask> = accum(C,op(A))
if (GB_NCOLS (C) == 1 && !atranspose)
{
// this is just to test the Vector version
OK (GrB_Vector_select_Scalar ((GrB_Vector) C, NULL, NULL, op,
(GrB_Vector) A, Thunk, NULL)) ;
}
else
{
OK (GrB_Matrix_select_Scalar (C, NULL, NULL, op, A, Thunk, desc)) ;
}
// return C as a sparse matrix and free the GraphBLAS C
pargout [0] = GB_mx_Matrix_to_mxArray (&C, "C output", false) ;
FREE_ALL ;
}
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