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function C = sparse (G)
%SPARSE make a copy of a GraphBLAS sparse matrix.
% If G is already sparse, C = sparse (G) simply makes a copy of G.
% If G is full or bitmap, C = sparse (G) returns C as sparse or hypersparse.
% Explicit zeros are not removed. To remove them use C = GrB.prune(G).
%
% See also GrB/issparse, GrB/full, GrB.type, GrB/prune, GrB.
% SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
% SPDX-License-Identifier: Apache-2.0
[~, sparsity] = gbformat (G.opaque) ;
switch (sparsity)
case { 'hypersparse', 'sparse' }
% nothing to do; G is already sparse or hypersparse
C = G ;
case { 'bitmap', 'full' }
% convert G to sparse or hypersparse
C = GrB (G, 'sparse/hypersparse') ;
end
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