Parametric plots from NDSolve
- To: mathgroup at smc.vnet.net
- Subject: [mg16523] Parametric plots from NDSolve
- From: Virgil Stokes <virgil.stokes at neuro.ki.se>
- Date: Tue, 16 Mar 1999 04:00:02 -0500
- Sender: owner-wri-mathgroup at wolfram.com
I have the following short piece of code for solving a system of 2 2nd order nonlinear differential eqs. Clear[p,q,r,P,Q,R]; p = 2; q = 2; r = 2/3; P = 2; Q= 4/3; R=-1; f = x[t] (p-r x[t] - q y[t]); g = y[t] (P-Q x[t] - R y[t]); eq = {x''[t] == f, y''[t] == g, x[0] == x0, x'[0] == 0.0,y[0] == y0, y'[0] == 0.0}; sol = NDSolve[eq /. {x0->3.5, y0->2},{x[t],y[t]},{t,0,2}]; This codes works fine; but, I have been unable to figure out how to plot: x'[t] vs y'[t] or x''[t] vs y''[t] How can one obtain parametric plots for the derivatives? -- V Stokes