On Sun, Mar 8, 2009 at 1:43 PM, alex
<alessandro.bernardini.1...@gmail.com> wrote:
>
> How can i compute the matrix multiplication (product) of two symbolic
> matrices in sage ?
>
> I have tried:
> A = maxima("matrix ([a, b], [c, d])")
> AI= A.invert()
>
> and
> A * AI
> gives
> matrix([a*d/(a*d-b*c),-b^2/(a*d-b*c)],[-c^2/(a*d-b*c),a*d/(a*d-b*c)])
Do you want the following?
sage: a,b,c,d = var("a,b,c,d")
sage: A = matrix ([[a, b], [c, d]])
sage: AI = A.inverse()
sage: P = A*AI; P
[a*d/(a*d - b*c) - b*c/(a*d - b*c) 0]
[ 0 a*d/(a*d - b*c) - b*c/(a*d - b*c)]
>
> so * is not the matrix product.
>
> I did not founf informations in any documentation !!
>
> So: How can i compute the matrix multiplication (product) of two
> symbolic matrices in sage ?
>
> THX !
>
> >
>
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to sage-support@googlegroups.com
To unsubscribe from this group, send email to
sage-support-unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/sage-support
URLs: http://www.sagemath.org
-~----------~----~----~----~------~----~------~--~---
