Hi everyone! (I'm Fench, hope my English isn't too bad). I use Maple to solve non-linear differential equations using a numeric method, and I plot these solutions using the basic: >slnew := dsolve({set1, set2, a1(0) = 0, a2(0) = 1, (D(a1))(0) = 0, (D(a2))(0) = 0}, {a1(t), a2(t)}, numeric); >plot1 := odeplot(slnew, [t, a2(t)], t = 0 .. 10, numpoints = 10000); So far it's ok. However, I'd like to compare the difference between the solutions when the initials conditions are slightly different, say, a2(0)=1.1 . So I use the same procedure to create a plot2, and I use: >display(plot1,plot2);