function y = asec(z)
%ASEC   Inverse secant.
%   ASEC(X) is the inverse secant of the elements of X.

%   Copyright (c) 1984-98 by The MathWorks, Inc.
%   $Revision: 5.3 $  $Date: 1997/11/21 23:28:05 $

y = acos(1./z);
