It almost sounds to me like you'd rather be working in a multivariate polynomial ring (which will be much, much faster).
- Robert On May 22, 2008, at 12:48 PM, Andrey Novoseltsev wrote: > Actually, yesterday was the first time I really tried to use Sage for > symbolic computations and it was quite frustrating for me. > > 1) It would be really nice if it was faster. > > 2) It seems to me that > ((x+y)*y).coeff(y^2) > and > ((x+y)*y).expand().coeff(y^2) > should return the same coefficient 1 (while the first one returns > zero). > > 3) I think that > ((x+x*y)/x).simplify() > should return 1+y, instead of the original expression, otherwise, what > is simplify simplifying? > > 4) It would be nice to be able to get the part of given degree in the > given list of variables, and write > f3 = fp.homogeneous_part([up, vp], 3) > instead of something like > f3 = (fp.coeff(up,3).coeff(vp,0)*up^3*vp^0 > + fp.coeff(up,2).coeff(vp,1)*up^2*vp^1 > + fp.coeff(up,1).coeff(vp,2)*up^1*vp^2 > + fp.coeff(up,0).coeff(vp,3)*up^0*vp^3) > --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
