function t = ne(a,b)
%NE Not equal for nominal arrays.
%   TF = NE(A,B) returns a logical array the same size as the nominal arrays A
%   and B, containing true (1) where the corresponding elements of A and B are
%   not equal, and false (0) otherwise.  A and B need not have the same sets
%   of levels.  The test is performed by comparing the labels of the levels of
%   each pair of elements.
%
%   TF = NE(A,S) or TF = NE(S,B), where S is a character string, returns a
%   logical array the same size as A or B, containing true (1) where the
%   levels of corresponding elements of A or B have labels not equal to S.
%
%   Elements with undefined levels are considered not equal to any other value,
%   including other undefined elements.
%
%   See also NOMINAL/EQ.

%   Copyright 2006 The MathWorks, Inc. 
%   $Revision: 1.1.8.2 $  $Date: 2006/12/15 19:32:15 $

[acodes,bcodes] = nominalcheck(a,b);

% undefined elements are not equal to everything
t = (acodes ~= bcodes) | (acodes == 0) | (bcodes == 0);