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function C = flip (A, dim)
%FLIP flip the order of elements.
% C = flip (A) flips the order of elements in each column of A. That is,
% C = A (end:-1:1,:). C = flip (A, dim) specifies the dimension to flip,
% so that flip (A,1) and flip (A) are the same thing, and flip (A,2) flips
% the columns so that C = A (:,end:-1,1).
%
% To use this function on a built-in matrix, use C = flip (A, GrB (dim)).
%
% See also GrB/transpose.
% SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
% SPDX-License-Identifier: Apache-2.0
a_is_object = isobject (A) ;
if (a_is_object)
G = A.opaque ;
else
G = A ;
end
[m, n] = gbsize (G) ;
if (nargin == 1)
if (m == 1)
dim = 2 ;
else
dim = 1 ;
end
else
dim = gb_get_scalar (dim) ;
end
dim = floor (double (dim)) ;
if (dim <= 0)
error ('GrB:error', 'dim must be positive') ;
end
if (dim == 1 && m ~= 1)
% C = A (m:-1:1, :)
C = GrB (gbextract (G, {m,-1,1}, { })) ;
elseif (dim == 2 && n ~= 1)
% C = A (:, n:-1:1)
C = GrB (gbextract (G, { }, {n,-1,1})) ;
elseif (a_is_object)
% nothing to do
C = A ;
else
% nothing to do except convert A to GrB
C = GrB (A) ;
end
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