Re: NDSolve Repeated convergence test failure
- To: mathgroup at smc.vnet.net
- Subject: [mg47135] Re: NDSolve Repeated convergence test failure
- From: Steven Rey Ortiz <sro7516 at cs.tamu.edu>
- Date: Sat, 27 Mar 2004 01:34:38 -0500 (EST)
- Organization: Texas A&M University, College Station, Texas
- References: <c3uem8$9ub$1@smc.vnet.net> <c40sv5$mrs$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Paul, Thank you so much for your reply. Reading your reply, I realized that I can identify the singularity, and solve this problem in a two part "piecewise" fashion. It would still be nice if NDSolve identified this transition from a second order to first order ODE and correctly integrated the entire solution, but perhaps there are technical reasons that it doesn't. So, for now, I have an effective workaround in place. Seeing the complete plot, I also realized I had a mistake in the control law, which I have corrected. The updated notebook is available here in case you are interested. http://students.cs.tamu.edu/sro7516/double-pendulum-2.nb Thank you! Steve