%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) 1984-94 by The MathWorks, Inc.
%	Built-in function.
