| I have a notebook to solve a differential equation using gsl's rkf45 algorithm. Now I realize that the equation is too stiff and rkf45 is may not be the right algorithm to use. The function I am trying to solve is written in C syntax. I want to try using octave's lsode to solve the same equation since it has a option of solving "stiff" equation. I don't know the jacobian of the equation so I can't use the stiff options in gsl. The problem is that my function is very complicated it took me a long time to type it out. So my question is - is it possible to solve a differential equation in octave where the rhs is written in C syntax.
This sounds like a question about Octave which is a completely different and separate system from Sage.
benjaminfjones (Aug 18 '11)
Sorry about that. I thought since I can call octave from sage notebooks it may not be too off the sage discussion.
Shashank (Aug 18 '11) |
0
 | Before going overboard, how about you try the other algorithms that GSL supports? See http://www.sagemath.org/doc/reference/sage/gsl/ode.html
That is the problem. All the gsl algorithms that solve stiff equations have to be provided with a jacobian. I don't know the jacobian. Its too complicated. lsode on the other hand numerically estimates the jacobian. I don't think any of the gsl algorithms do that.
Shashank (Aug 18 '11) |
Asked: Aug 18 '11
Seen: 108 times
Last updated: Aug 18 '11
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