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union.m
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1998-11-10
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## Copyright (C) 1996, 1997 John W. Eaton
##
## This file is part of Octave.
##
## Octave is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2, or (at your option)
## any later version.
##
## Octave is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Octave; see the file COPYING. If not, write to the Free
## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
## 02111-1307, USA.
## usage: union(a,b)
##
## Returns the union of sets a and b.
##
## See - create_set, intersection, complement
## Author: jwe
function y = union(a,b)
if (nargin != 2)
usage ("union(a,b)");
endif
if(isempty(a))
y = create_set(b);
elseif(isempty(b))
y = create_set(a);
else
[nra, nca] = size(a);
a = reshape(a,1,nra*nca);
[nrb, ncb] = size(b);
b = reshape(b,1,nrb*ncb);
y = create_set([a, b]);
endif
endfunction