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Can octave call a c function?

asked 2011-08-18 11:23:49 -0500

Shashank gravatar image

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.

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This sounds like a question about Octave which is a completely different and separate system from Sage.

benjaminfjones gravatar imagebenjaminfjones ( 2011-08-18 14:42:10 -0500 )edit

Sorry about that. I thought since I can call octave from sage notebooks it may not be too off the sage discussion.

Shashank gravatar imageShashank ( 2011-08-18 17:30:16 -0500 )edit

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answered 2011-08-18 17:36:31 -0500

Volker Braun gravatar image

Before going overboard, how about you try the other algorithms that GSL supports? See http://www.sagemath.org/doc/reference...

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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 gravatar imageShashank ( 2011-08-18 18:06:33 -0500 )edit

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Asked: 2011-08-18 11:23:49 -0500

Seen: 227 times

Last updated: Aug 18 '11