[sage-support] Re: Sage/Maxima desolve_rk4 problem

2010-04-21 Thread jvkersch
Dear Robert, Thanks a lot for the suggestion. After typing in ode_solve, the tab- completion guided me to the class ode_solver, which also works like a charm. This is the reason for my late reply: I was so glad to get everything working that I lost all track of time... I know this is not the

[sage-support] Re: Sage/Maxima desolve_rk4 problem

2010-04-20 Thread ma...@mendelu.cz
On 20 dub, 09:39, jvkersch joris.vankerscha...@gmail.com wrote: Thanks Robert, this seems to be the problem. I wish I were a lisp programmer so that I could dive into Maxima and put in a call to coerce-float-fun myself, but while I'm eager to tinker with this, I'm not sure I can be

[sage-support] Re: Sage/Maxima desolve_rk4 problem

2010-04-19 Thread Robert Dodier
Looks like the rk function in Maxima doesn't try hard enough to float-ify its argument. I haven't looked at the code, but maybe rk can call COERCE-FLOAT-FUN to construct a function to evaluate the expression. At least that would bring it into line with other Maxima functions which evaluate