Mathematica 9 is now available
Student Support Forum
Student Support Forum: 'unwanted evaluation at very large T' topicStudent Support Forum > General > Archives > "unwanted evaluation at very large T"

Next Comment >Help | Reply To Topic
Author Comment/Response
Robert Hoy
07/30/01 02:19am

I am trying to numerically solve a system of 3
coupled nonlinear ordinary differential equations.
I am reasonably sure that the only singularity in the system is for one variable at t= +infinity.
I have also checked carefully for nonnumeric quantities in the equations and can't find any.
t is the independent variable. When I try to solve the system I get

NDSolve::ndnum : Encountered non-numerical value for a derivative at t = 1.8066...`*^38.

This message occurs _regardless_ of the initial conditions I enter. I assume this means there's some problem at t = 1.8066*10^38. I only want to solve the equations for 0 < t < 100, so I don't need Mathematica to evaluate the equations for t >> 100. How can I get around this?

URL: ,

Subject (listing for 'unwanted evaluation at very large T')
Author Date Posted
unwanted evaluation at very large T Robert Hoy 07/30/01 02:19am
Re: unwanted evaluation at very large T Forum Modera... 08/09/01 4:06pm
Next Comment >Help | Reply To Topic