function y = acosh(z)
%ACOSH  Inverse hyperbolic cosine.
%   ACOSH(X) is the inverse hyperbolic cosine of the elements of X.

%   Copyright (c) 1984-98 by The MathWorks, Inc.
%   $Revision: 5.4 $  $Date: 1998/05/22 22:01:29 $
%   Built-in function.
