function y = sech(z)
%SECH   Hyperbolic secant.
%   SECH(X) is the hyperbolic secant of the elements of X.

%   Copyright (c) 1984-98 by The MathWorks, Inc.
%   $Revision: 5.3 $  $Date: 1997/11/21 23:28:34 $

y = 1./cosh(z);
