Hi,
On Thu, Aug 27, 2009 at 1:00 AM, William Stein<wst...@gmail.com> wrote: > > On Wed, Aug 26, 2009 at 7:56 PM, Robert > Bradshaw<rober...@math.washington.edu> wrote: >>>> x[1], and then x[1] would create another symbolic variable x[1][1]. >>>> >>> >>> That sounds pretty easy to implement by defining __getitem__ for >>> symbolic variables, and making it cache its answer using a dictionary. >> >> I've advocated for this before--I think it's a great idea. >> > > Yes, this makes a lot of sense to me, since it's very common in > mathematics to have expressions like x_i, where i is some variable. Does GiNaC/pynac's native "indexed object" help here? http://www.ginac.de/tutorial/Indexed-objects.html#Indexed-objects If so then it may be a good idea to expose these to sage by wrapping them suitably. Cheers, Golam --~--~---------~--~----~------------~-------~--~----~ To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
