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function [edges, idx, edgemap] = uniqedges(elem)
%
% [edges,idx,edgemap]=uniqedges(elem)
%
% return the unique edge list from a surface or tetrahedral mesh
%
% author: Qianqian Fang, <q.fang at neu.edu>
%
% input:
% elem: a list of elements, each row is a list of nodes for an element.
% elem can have 2, 3 or 4 columns
%
% output:
% edge: unique edges in the mesh, denoted by a pair of node indices
% idx: index of the output in the raw edge list (returned by meshedge)
% edgemap: index of the raw edges in the output list (for triangular mesh)
%
% -- this function is part of iso2mesh toolbox (http://iso2mesh.sf.net)
%
if (size(elem) == 2)
edges = elem;
elseif (size(elem) >= 3)
edges = meshedge(elem);
else
error('invalid input');
end
[uedges, idx, jdx] = unique(sort(edges, 2), 'rows');
edges = edges(idx, :);
if (nargout > 2)
edgemap = reshape(jdx, [size(elem, 1) nchoosek(size(elem, 2), 2)]);
end
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