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//------------------------------------------------------------------------------
// GB_mex_diag: compute C=diag(A,k)
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// C = diag (A,k), where A and C are double
// C is a matrix the same size as A, not a vector.
#include "GB_mex.h"
#define USAGE "C = GB_mex_diag (A,k)"
#define FREE_ALL \
{ \
GrB_Scalar_free_(&Thunk) ; \
GrB_Matrix_free_(&A) ; \
GrB_Matrix_free_(&C) ; \
GB_mx_put_global (true) ; \
}
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 ;
GrB_Scalar Thunk = NULL ;
// check inputs
if (nargout > 1 || nargin < 1 || nargin > 2)
{
mexErrMsgTxt ("Usage: " USAGE) ;
}
#define GET_DEEP_COPY ;
#define FREE_DEEP_COPY ;
// 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]) ;
}
// 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) ;
GrB_Scalar_new (&Thunk, GrB_INT64) ;
GrB_Scalar_setElement_INT64_(Thunk, k) ;
GrB_Scalar_wait_(Thunk, GrB_MATERIALIZE) ;
// C = diag (A,k)
METHOD (GxB_Matrix_select_(C, NULL, NULL, GxB_DIAG, A, Thunk, NULL)) ;
// return C as a regular built-in sparse matrix
pargout [0] = GB_mx_Matrix_to_mxArray (&C, "C diag", false) ;
FREE_ALL ;
}
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