Hi, I have a small question. I am simulating a nonlinear system 
I am interested in plotting the following
I dont know how to integrate the state x2 according to figure 2. My code is below
Clear[x];
nsys = NonlinearStateSpaceModel[{{ Subscript[x, 2],
-Subscript[x, 1]*(Pi/2+ArcTan[5*Subscript[x,1]]) -(5Subscript[x,
1]^2/(2+50*Subscript[x,1]^2))-5Subscript[x,2]}, {Subscript[x, 1]}}, {Subscript[x, 1],
Subscript[x, 2]},]
J= StateResponse[{nsys, {3,-2}},, {t, 0, 200}];
Plot[J, {t, 0, 20},PlotRange->Full]
