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ode45 gives solution in the "Dark Side," but not in Octave


From: John W. Eaton
Subject: ode45 gives solution in the "Dark Side," but not in Octave
Date: Tue, 1 Sep 2009 18:00:18 -0400

On  1-Sep-2009, John B. Thoo wrote:

| Hi.  I have a question about using ode45 in Octave 3.2.2 (and OdePkg  
| on Mac OS X 10.4.11) vs. in the "Dark Side" 7.4.0 (R2007a) (on a  
| server ... Linux?).  My code can be found here at the moment:
| 
| <http://ms.yccd.edu/~jb2/PickUp/twoway.zip>
| 
| "run_twoway.m" executes the code.
| 
| Both Octave and the Dark Side solve the problem (i.e., do not return  
| an error) to produce a solution  u,  and both give
| 
|  > size (u)
| ans =
| 
|     8192    102
| 
| However, while I can plot the solution in the Dark Side, in Octave I  
| can plot only the first four frames.  In fact, in Octave I get  NaN +  
| 0.00000i  from  u(:,5)  on.  Why is that?
| 
| I would appreciate any hints.  Thanks.

Have you tried using lsode in Octave instead of ode45 (which is not
part of Octave, BTW).

jwe


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