maxsteps, startingstepsize in NDSolve.
- To: mathgroup at smc.vnet.net
- Subject: [mg43412] maxsteps, startingstepsize in NDSolve.
- From: sean kim <shawn_s_kim at yahoo.com>
- Date: Tue, 16 Sep 2003 04:36:23 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
hello group. it's been sugested that the problem i was having with my earlier post was due more or less to starting step size, number of maximum steps. is it possible that the the weird oscillations seen and the failures are due to the accumulative numerical errors? i have tried changing maxstep size and starting stepsize but it seems do very little. is there a limit as to how high ( maxsteps) and how low( starting step size) i can designate? if so what are they? and what else can i do here to ensure more accurate results from the NDSolve? I have tried precision goals and accuracy goals along with machine precision but it seems to take too long with the step size i have specified. ( at the time i was using like 100000000 steps. since then i have tried it with smaller number of steps but the speed seems to be an issue) thanks in advance for all helpful comments as always. sean __________________________________ Do you Yahoo!? The New Yahoo! Search - Faster. Easier. Bingo. http://search.yahoo.com