Hi!

I have a system of equations like this:

and I wrote this equations into maple in this way:

eqns := [diff(x(t), t) = -x(t)-y(t), diff(y(t), t) = x(t)+.25*y(t)+r(t), diff(z(t), t) = 3+x(t)*z(t), diff(r(t), t) = .5*z(t)+0.5e-1*r]

using DEplot3d I tried to drawing attractor diagram: