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    function c = or( c1, c2 )
%OR Logical OR of two constraints (union of two constraints)
%
%  C = OR(C1,C2) is the union of the constraints C1 and C2, i.e., a point X
%  is in OR(C1,C2) if and only if it is inside C1 or it is inside C2. 
%
%  C1 and C2 must be the same size (as returned by GETSIZE)
%  
%  See also CONBASE/NOT, CONBASE/AND, CONBASE/XOR, CONBOOLEAN, GETSIZE.

%  Copyright 2000-2005 The MathWorks, Inc. and Ford Global Technologies, Inc.


% check n input factors to constraints
if nFactors( c1 ) ~= nFactors( c2 ),
    error(message('mbc:conbase:InvalidArgument'));
end

if isa( c2, 'conboolean' ),
    c = or( c2, c1 );
else
    c = conboolean( 'Or', c1, c2 );
end