On Thu, Aug 28, 2008 at 11:04 AM, David Ketcheson <[EMAIL PROTECTED]> wrote: > > For now I have resorted to simply manipulating strings for what I > want, which is simply to be able to do symbolic algebra with matrices > and vectors. I may be interested in developing this functionality > myself for Sage. What is the plan for symbolic algebra in sage?
It will be replaced by completely new code based on GiNaC as soon as possible. http://www.ginac.de/ Ginac does support non-commuting symbols, since it's aimed at physics, and Ginac is very fast. > Will 'var's eventually do everything? Hopefully everything you need for the current computation. > Will Sympy functionality replace var? It depends. By the way, if your expressions only involve polynomials in the noncommuting symbols you may be able to use FreeAlgebra: sage: R.<x,y> = FreeAlgebra(QQ,2) sage: 1/2 + y*x 1/2 + y*x sage: 1/2 + x*y 1/2 + x*y sage: R.<x,y> = FreeAlgebra(SR,2) sage: var('w,a,b') (w, a, b) sage: sin(a)*w*x + cos(b)^a*x^3*y sin(a)*w*x + cos(b)^a*x^3*y William --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
