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## Copyright (C) 2024 David Legland
## All rights reserved.
##
## Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are met:
##
## 1 Redistributions of source code must retain the above copyright notice,
## this list of conditions and the following disclaimer.
## 2 Redistributions in binary form must reproduce the above copyright
## notice, this list of conditions and the following disclaimer in the
## documentation and/or other materials provided with the distribution.
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ''AS IS''
## AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
## IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
## ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
## ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
## DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
## SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
## CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
## OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
##
## The views and conclusions contained in the software and documentation are
## those of the authors and should not be interpreted as representing official
## policies, either expressed or implied, of the copyright holders.
function node2 = grOppositeNode(edges, node)
%GROPPOSITENODE Return opposite node in an edge.
%
% NODE2 = grOppositeNode(EDGE, NODE);
% Return the index of the node opposite to NODE in EDGE.
% If the edge does not contain node NODE, result is 0.
%
% Works also if EDGE is a N-by-2 array of source and target vertex
% indices, in this case the result NODE2 has as many rows as the number
% of edges.
% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2010-09-07
% Copyright 2010-2023 INRA - CEPIA Nantes - MIAJ (Jouy-en-Josas)
% allocate memory for result
Ne = size(edges, 1);
node2 = zeros(Ne, 1);
% iterate on edges
for i = 1:Ne
if edges(i,1) == node
node2(i) = edges(i,2);
elseif edges(i,2) == node
node2(i) = edges(i,1);
end
end
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