%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 the nonzero elements of complex X,
%   SIGN(X) = X ./ ABS(X). 

%   Copyright 1984-2000 The MathWorks, Inc. 
%   $Revision: 5.6 $  $Date: 2000/06/01 00:40:24 $
%   Built-in function.
