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//------------------------------------------------------------------------------
// GB_mex_tril: compute C=tril(A,1)
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2020, All Rights Reserved.
// http://suitesparse.com See GraphBLAS/Doc/License.txt for license.
//------------------------------------------------------------------------------
// C = tril (A,k), where A and C are double
#include "GB_mex.h"
#define USAGE "C = GB_mex_tril (A,k)"
#define FREE_ALL \
{ \
GB_SCALAR_FREE (&Thunk) ; \
GB_MATRIX_FREE (&A) ; \
GB_MATRIX_FREE (&C) ; \
GB_mx_put_global (true, 0) ; \
}
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
bool malloc_debug = GB_mx_get_global (true) ;
GrB_Matrix A = NULL, C = NULL ;
GxB_Scalar Thunk = NULL ;
// check inputs
GB_WHERE (USAGE) ;
if (nargout > 1 || nargin < 1 || nargin > 2)
{
mexErrMsgTxt ("Usage: " USAGE) ;
}
// get A
A = GB_mx_mxArray_to_Matrix (pargin [0], "A", false, true) ;
if (A == NULL)
{
FREE_ALL ;
mexErrMsgTxt ("failed") ;
}
int64_t k = 0 ;
// get k
if (nargin > 1)
{
k = (int64_t) mxGetScalar (pargin [1]) ;
}
#define GET_DEEP_COPY ;
#define FREE_DEEP_COPY ;
// construct C
METHOD (GrB_Matrix_new (&C, GrB_FP64, A->vlen, A->vdim)) ;
#undef GET_DEEP_COPY
#undef FREE_DEEP_COPY
#define GET_DEEP_COPY GrB_Matrix_new (&C, GrB_FP64, A->vlen, A->vdim) ;
#define FREE_DEEP_COPY GrB_Matrix_free_(&C) ;
GxB_Scalar_new (&Thunk, GrB_INT64) ;
GxB_Scalar_setElement_INT64_(Thunk, k) ;
GrB_Index ignore ;
GxB_Scalar_nvals (&ignore, Thunk) ;
// C = tril (A,k)
METHOD (GxB_Matrix_select_(C, NULL, NULL, GxB_TRIL, A, Thunk, NULL)) ;
// return C to MATLAB as a regular MATLAB sparse matrix
pargout [0] = GB_mx_Matrix_to_mxArray (&C, "C tril", false) ;
FREE_ALL ;
}
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