On Feb 6, 4:12 am, Burcin Erocal <[email protected]> wrote: > On Sat, 5 Feb 2011 18:16:54 -0800 (PST) > > kcrisman <[email protected]> wrote: > > > > Now browse into taylor?? source, and you see that sage call the > > > taylor function in maxima. > > > > The taylor function in maxima seems very long to follow in > > > ...maxima.../src/hayat.lisp. > > > More to the point, Maxima doesn't know about any 'special' things you > > define like that. Our basic differentiation is handled by Ginac/ > > Pynac, which does not have Taylor series (does it?). So unfortunately > > I don't know that this is something one can (yet) do directly in > > Sage. It might be possible in Maxima directly, if one can define > > custom derivatives there. > > The series expansion from GiNaC can be accessed with the .series() > method. This should take into account the custom differentiation > function.
I didn't realize this. Is there anything (such as multivariate, order etc.) that this is missing from Maxima series? > Unfortunately, GiNaC has problems with series expansions around > singularities. This was fixed recently in upstream [1], but I haven't > checked if the fix covers all the cases reported on trac [2]. > > [1]http://www.ginac.de/ginac.git?p=ginac.git;a=commit;h=079c558d4f9758cd... > > [2]http://trac.sagemath.org/sage_trac/ticket/9555 > http://trac.sagemath.org/sage_trac/ticket/8943 > > I really need to make a new pynac release... In which case I really need to review it! - kcrisman -- To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
