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//------------------------------------------------------------------------------
// GrB_Matrix_diag: construct a diagonal matrix from a vector
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// Similar to GxB_Matrix_diag (C, v, k, NULL), except that C is constructed
// as a new matrix, like GrB_Matrix_new. C has the same type as v.
#include "diag/GB_diag.h"
#define GB_FREE_ALL ;
GrB_Info GrB_Matrix_diag // construct a diagonal matrix from a vector
(
GrB_Matrix *C, // output matrix
const GrB_Vector v, // input vector
int64_t k
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
GB_WHERE_1 (v, "GrB_Matrix_diag (&C, v, k)") ;
GB_RETURN_IF_NULL (v) ;
GB_BURBLE_START ("GrB_Matrix_diag") ;
//--------------------------------------------------------------------------
// C = diag (v,k)
//--------------------------------------------------------------------------
uint64_t n = v->vlen + GB_IABS (k) ;
GB_OK (GB_Matrix_new (C, v->type, n, n)) ;
GB_OK (GB_Matrix_diag (*C, (GrB_Matrix) v, k, Werk)) ;
GB_BURBLE_END ;
return (GrB_SUCCESS) ;
}
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