Re: Coupled second-order nonlinear ODEs
- To: mathgroup at smc.vnet.net
- Subject: [mg90527] Re: Coupled second-order nonlinear ODEs
- From: Alois Steindl <Alois.Steindl at tuwien.ac.at>
- Date: Fri, 11 Jul 2008 05:57:11 -0400 (EDT)
- References: <g54olq$f15$1@smc.vnet.net> <g56taq$3s5$1@smc.vnet.net>
Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com> writes: > > Your system is really stiff, I mean *really* stiff, on the given range > for y. Do you need m as large as twenty? Everything is fine up to m > about 1.4. Setting m = 7/5, we do not need to add any options to NDSolve > and it does not return any warning message. > Hello, my impression is, that the system isn't just stiff, but that there is a "finite time blow up" close to y=1.4, where the solution has a pole. Compare the simple nonlinear ode y'=y^3, y(0)=1. Alois