| Author |
Comment/Response |
Carolina Oedman
|
 01/30/00 3:19pm
Hi!
I have a system of two non-linear 2nd-order differential equations in terms of x(t), x'(t), x''(t), y(t), y'(t), t
The system is not very unstable, but near zero the values are out of the range of the machine. I thought it would'nt matter since I integrate from t = 66 to 72 with initial conditions at t = 66, but I get this message:
NDSolve::''ndnum'': ''Encountered non-numerical value for a derivative at
t == 2.524140890933554`*^-299.''
Does Mathematica always intergate from 0 even if the range asked for is far from 0? If so, how can I avoid that problem?
Since my solutions should all funnel to the same kind of behavior at very large t, it is clearly unstable to integrate with final conditions!
Thanks
Carolina Oedman
URL: , |
|
