function y = asech(z)
%ASECH  Inverse hyperbolic secant.
%   ASECH(X) is the inverse hyperbolic secant of the elements of X.
%
%   Class support for input X:
%      float: double, single
%
%   See also SECH.

%   Copyright 1984-2004 The MathWorks, Inc.
%   $Revision: 5.7.4.3 $  $Date: 2004/06/25 18:51:47 $

y = acosh(1./z);