matrixの上下の反転 Flip a matrix from up to bottom

使えそうなコードを見つけた・・・flipud
matrixをup & downと反転させる場合に使えそう。

function y = flipud(x)
%FLIPUD Flip matrix in up/down direction.
% FLIPUD(X) returns X with columns preserved and rows flipped
% in the up/down direction. For example,
%
% X = 1 4 becomes 3 6
% 2 5 2 5
% 3 6 1 4
%
% Class support for input X:
% float: double, single
%
% See also FLIPLR, ROT90, FLIPDIM.

% Copyright 1984-2004 The MathWorks, Inc.
% $Revision: 5.9.4.3 $ $Date: 2004/07/05 17:01:15 $

if ndims(x)~=2
error('MATLAB:flipud:SizeX', 'X must be a 2-D matrix.');
end
y = x(end:-1:1,:);