%yp = [ ];
y0 = [.2 .3 .4]; 
options = odeset('RelTol',.0000001,'AbsTol',.000000001)
r = 1.5;
tspan = [0:.01:50];
[tt,yy] = ode45('lor',tspan,y0,options,r);
plot3(yy(:,1),yy(:,2),yy(:,3));