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//------------------------------------------------------------------------------
// GB_Matrix_new: create a new matrix
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// The new matrix is nrows-by-ncols, with no entries in it. Default format for
// an empty matrix is hypersparse CSC: A->p is size 2 and all zero, A->h is
// size 1, A->plen is 1, and contents A->x and A->i are NULL. If this method
// fails, *A is set to NULL.
#include "GB.h"
GrB_Info GB_Matrix_new // create a new matrix with no entries
(
GrB_Matrix *A, // handle of matrix to create
GrB_Type type, // type of matrix to create
GrB_Index nrows, // matrix dimension is nrows-by-ncols
GrB_Index ncols,
GB_Context Context
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
GB_RETURN_IF_NULL (A) ;
(*A) = NULL ;
GB_RETURN_IF_NULL_OR_FAULTY (type) ;
if (nrows > GB_NMAX || ncols > GB_NMAX)
{
// problem too large
return (GrB_INVALID_VALUE) ;
}
//--------------------------------------------------------------------------
// create the matrix
//--------------------------------------------------------------------------
int64_t vlen, vdim ;
bool A_is_csc ;
if (ncols == 1)
{
// n-by-1 matrices are always held by column, including 1-by-1
A_is_csc = true ;
}
else if (nrows == 1)
{
// 1-by-n matrices (except 1-by-1) are always held by row
A_is_csc = false ;
}
else
{
// m-by-n (including 0-by-0) with m != and n != use the global setting
A_is_csc = GB_Global_is_csc_get ( ) ;
}
if (A_is_csc)
{
vlen = (int64_t) nrows ;
vdim = (int64_t) ncols ;
}
else
{
vlen = (int64_t) ncols ;
vdim = (int64_t) nrows ;
}
return (GB_new (A, // auto sparsity, new header
type, vlen, vdim, GB_Ap_calloc, A_is_csc, GxB_AUTO_SPARSITY,
GB_Global_hyper_switch_get ( ), 1, Context)) ;
}
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