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//------------------------------------------------------------------------------
// GxB_Matrix_unpack_CSC: unpack a matrix in CSC format
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
#include "import_export/GB_export.h"
#define GB_FREE_ALL ;
GrB_Info GxB_Matrix_unpack_CSC // unpack a CSC matrix
(
GrB_Matrix A, // matrix to unpack (type, nrows, ncols unchanged)
uint64_t **Ap, // column "pointers"
uint64_t **Ai, // row indices
void **Ax, // values
uint64_t *Ap_size, // size of Ap in bytes
uint64_t *Ai_size, // size of Ai in bytes
uint64_t *Ax_size, // size of Ax in bytes
bool *iso, // if true, A is iso
bool *jumbled, // if true, indices in each column may be unsorted
const GrB_Descriptor desc
)
{
//--------------------------------------------------------------------------
// check inputs and get the descriptor
//--------------------------------------------------------------------------
GB_RETURN_IF_NULL (A) ;
GB_RETURN_IF_OUTPUT_IS_READONLY (A) ;
GB_WHERE_1 (A, "GxB_Matrix_unpack_CSC (A, &Ap, &Ai, &Ax, &Ap_size,"
" &Ai_size, &Ax_size, &iso, &jumbled, desc)") ;
GB_BURBLE_START ("GxB_Matrix_unpack_CSC") ;
GB_GET_DESCRIPTOR (info, desc, xx1, xx2, xx3, xx4, xx5, xx6, xx7) ;
//--------------------------------------------------------------------------
// ensure the matrix is in by-col format
//--------------------------------------------------------------------------
if (!(A->is_csc))
{
// A = A', done in-place, to put A in by-col format
GB_OK (GB_transpose_in_place (A, true, Werk)) ;
}
//--------------------------------------------------------------------------
// finish any pending work
//--------------------------------------------------------------------------
if (jumbled == NULL)
{
// the unpacked matrix cannot be jumbled
GB_MATRIX_WAIT (A) ;
}
else
{
// the unpacked matrix is allowed to be jumbled
GB_MATRIX_WAIT_IF_PENDING_OR_ZOMBIES (A) ;
}
//--------------------------------------------------------------------------
// ensure the matrix is sparse
//--------------------------------------------------------------------------
GB_OK (GB_convert_any_to_sparse (A, Werk)) ;
//--------------------------------------------------------------------------
// unpack the matrix
//--------------------------------------------------------------------------
ASSERT (GB_IS_SPARSE (A)) ;
ASSERT ((A->is_csc)) ;
ASSERT (!GB_ZOMBIES (A)) ;
ASSERT (GB_IMPLIES (jumbled == NULL, !GB_JUMBLED (A))) ;
ASSERT (!GB_PENDING (A)) ;
int sparsity ;
bool is_csc ;
GrB_Type type ;
uint64_t vlen, vdim ;
info = GB_export (true, &A, &type, &vlen, &vdim, false,
Ap, Ap_size, // Ap
NULL, NULL, // Ah
NULL, NULL, // Ab
Ai, Ai_size, // Ai
Ax, Ax_size, // Ax
NULL, jumbled, NULL, // jumbled or not
&sparsity, &is_csc, // sparse by col
iso, Werk) ;
if (info == GrB_SUCCESS)
{
ASSERT (sparsity == GxB_SPARSE) ;
ASSERT (is_csc) ;
}
GB_BURBLE_END ;
return (info) ;
}
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