2009/5/17 Ondrej Certik <ond...@certik.cz> > > On Sun, May 17, 2009 at 12:39 PM, Vinzent Steinberg > <vinzent.steinb...@googlemail.com> wrote: > > 2009/5/17 Fredrik Johansson <fredrik.johans...@gmail.com> > >> > >> On Sun, May 17, 2009 at 12:25 PM, Vinzent Steinberg > >> <vinzent.steinb...@googlemail.com> wrote: > >> > Yeah, this is what I changed in my patch. 0.001 was too small, but > 0.01 > >> > did > >> > the job. Shouldn't this be the default instead of 0.25? > >> > >> There's a tradeoff, and there are examples where 0.01 fails too... > > > > What's the tradeoff? 0.25 seems somewhat large to me. Do you think > > findroot() should use Newton's method by default to avoid the problems > > Ondrej had? > > > > Maybe there's some heuristic to choose a good stepsize for a given > function. > > I like that secant is faster. > > What I don't like is that scipy works out of the box, while mpmath doesn't.
I just added Newton's method to mpmath svn, so it now should also work out of the box, if you are using method='newton'. Vinzent --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sympy-patches" group. To post to this group, send email to sympy-patches@googlegroups.com To unsubscribe from this group, send email to sympy-patches+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sympy-patches?hl=en -~----------~----~----~----~------~----~------~--~---
