%SIGN   Signum function.
%   For each element of X, SIGN(X) returns 1 if the element
%   is greater than zero, 0 if it equals zero and -1 if it is
%   less than zero.  For complex X, SIGN(X) = X ./ ABS(X). 

%   Copyright (c) 1984-98 by The MathWorks, Inc.
%   $Revision: 5.3 $  $Date: 1997/11/21 23:28:35 $
%   Built-in function.
