%PI     3.1415926535897....
%   PI = 4*atan(1) = imag(log(-1)) = 3.1415926535897....

%   Copyright (c) 1984-98 by The MathWorks, Inc.
%   $Revision: 5.3 $  $Date: 1997/11/21 23:29:19 $
%   Built-in function.
