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//------------------------------------------------------------------------------
// GB_convert_to_nonfull: ensure a matrix is not full (hyper, sparse, or bitmap)
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// The matrix A must be converted from full to any other sparsity structure.
// The full sparsity structure cannot tolerate the deletion of any entry but
// the other three can.
#include "GB.h"
GrB_Info GB_convert_to_nonfull // ensure a matrix is not full
(
GrB_Matrix A,
GB_Werk Werk
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
ASSERT (GB_IS_FULL (A)) ;
//--------------------------------------------------------------------------
// convert to bitmap, sparse, or hypersparse
//--------------------------------------------------------------------------
int sparsity_control = GB_sparsity_control (A->sparsity_control, A->vdim) ;
if (sparsity_control & GxB_BITMAP)
{
// C can become bitmap
return (GB_convert_full_to_bitmap (A)) ;
}
else if (sparsity_control & GxB_SPARSE)
{
// C can become sparse
return (GB_convert_full_to_sparse (A, Werk)) ;
}
else if (sparsity_control & GxB_HYPERSPARSE)
{
// C can become hypersparse
return (GB_convert_any_to_hyper (A, Werk)) ;
}
else
{
// none of the above conditions hold so make A bitmap
return (GB_convert_full_to_bitmap (A)) ;
}
}
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