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function C = reshape (G, varargin)
%RESHAPE reshape a matrix.
% C = reshape (G, m, n) or C = reshape (G, [m n]) returns the m-by-n
% matrix whose elements are taken columnwise from G. The matrix G must
% have numel (G) == m*n. That is numel (G) == numel (C) must be true.
%
% An optional parameter allows G to be to be reshaped row-wise instead
% of columnwise: C = reshape (G, m, n, 'by row') or C =
% reshape (G, [m n], 'by row'). The default is 'by column'.
%
% See also GrB/numel, squeeze.
% SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
% SPDX-License-Identifier: Apache-2.0
if (isobject (G))
G = G.opaque ;
end
% the third output of gb_parse_args is not actually a type, but 'by row', 'by
% col', or 'double' if not present on input.
[mnew, nnew, type] = gb_parse_args ('reshape', varargin {:}) ;
mnew = int64 (mnew) ;
nnew = int64 (nnew) ;
switch (type)
case 'by row'
by_col = false ;
case { 'by column', 'double' }
% if type is 'double', the row/colwise parameter is not present
by_col = true ;
otherwise
error ('GrB:error', 'unknown reshape option') ;
end
C = GrB (gbreshape (G, mnew, nnew, by_col)) ;
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