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

%   Copyright 1984-2000 The MathWorks, Inc. 
%   $Revision: 5.5 $  $Date: 2000/06/01 16:46:40 $
%   Built-in function.
