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? Will
'var's eventually do everything? Will Sympy functionality replace
var?
-David
On Aug 28, 10:07 am, "William Stein" <[EMAIL PROTECTED]> wrote:
> On Thu, Aug 28, 2008 at 9:54 AM, Robert Bradshaw
>
>
>
> <[EMAIL PROTECTED]> wrote:
>
> > On Aug 27, 2008, at 1:54 PM, David Ketcheson wrote:
>
> >> Thanks for the nice fix. I've managed to break things in a new way:
>
> >> sage: from sympy import Symbol
> >> sage: x,y=Symbol('x',False),Symbol('y',False)
> >> sage: 1/2+y*x
> >> x*y + 1/2
> >> sage: y*x+1/2
> >> 1/2 + y*x
> >> <<<
>
> >> The 'False' argument to Symbol here means the symbols are non-
> >> commutative. Adding a rational breaks this, depending on the order of
> >> addition. Seems like this is more likely a Sympy bug than a Sage bug
> >> though.
>
> > Yes, I think this is a SimPy bug. It looks like GiNaC handles non-
> > commutative symbols, so you could give that a try.
>
> GiNaC does, but Burcin and I did not wrap that functionality
> in GiNaC yet.
>
> 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
-~----------~----~----~----~------~----~------~--~---
