function xdot=saddle1(t,x)
% Example: Saddle (n°1)

xdot(1)=-x(1);
xdot(2)=4.*x(2);
xdot=xdot';


% "Complex and Chaotic Nonlinear Dynamics. 
% Advances in Economics and Finance, 
% Mathematics and Statistics" 
% T.Vialar, Springer 2009
% Copyright(c).