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union.m
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1999-12-24
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56 lines
## 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.
## -*- texinfo -*-
## @deftypefn {Function File} {} union (@var{x}, @var{y})
## Return the set of elements that are in either of the sets @var{x} and
## @var{y}. For example,
##
## @example
## @group
## union ([ 1, 2, 4 ], [ 2, 3, 5 ])
## @result{} [ 1, 2, 3, 4, 5 ]
## @end group
## @end example
## @end deftypefn
## See also: crt_set, intrsect, complmnt
## Author: jwe
function y = union(a,b)
if (nargin != 2)
usage ("union(a,b)");
endif
if(isempty(a))
y = crt_set(b);
elseif(isempty(b))
y = crt_set(a);
else
[nra, nca] = size(a);
a = reshape(a,1,nra*nca);
[nrb, ncb] = size(b);
b = reshape(b,1,nrb*ncb);
y = crt_set([a, b]);
endif
endfunction