Re: lsode question

[Olaf Till]

On Wed, Dec 07, 2011 at 02:15:08AM -0800, dogan_79 wrote:
> Thank you very much for the nice answers, but I am still uncertain about some
> things as I am newbie to Octave. 
> 
> My physical problem is to solve the differential equation describing the
> motion of a point mass inside a spherical bowl which is also subjected to
> surface friction with the bowl. The friction constant is constant (mu in the
> code.) What is interesting about this problem is to see the effect of the
> initial velocity (as the friction will also depend on increasing velocity
> via centripetal force) So we were discussing the situation with some
> collegues and none of us had a intuitive feeling about the difference in
> motion if we threw or released the mass initially. 

If lsode gets stuck on this problem I'd take this as a strong advise
to double-check the differential equations ... and what makes me
suspicious is the use of the 'sign' function ...

Olaf