#4608: roots method broken for root system lattices
-----------------------------+----------------------------------------------
Reporter: saliola | Owner: hivert
Type: defect | Status: new
Priority: major | Milestone: sage-4.4
Component: combinatorics | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Changes (by hivert):
* owner: mhansen => hivert
* upstream: => N/A
Comment:
This ticket should be closed. The issues is now fixed:
{{{
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| Sage Version 4.3.4, Release Date: 2010-03-19 |
| Type notebook() for the GUI, and license() for information. |
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Loading Sage library. Current Mercurial branch is: combinat
sage: R = RootSystem(['A',2])
sage: R.coroot_lattice().roots()
[alphacheck[1], alphacheck[2], alphacheck[1] + alphacheck[2],
-alphacheck[1], -alphacheck[2], -alphacheck[1] - alphacheck[2]]
sage: R.coweight_lattice().roots()
[-Lambdacheck[1] + 2*Lambdacheck[2], Lambdacheck[1] + Lambdacheck[2],
2*Lambdacheck[1] - Lambdacheck[2], Lambdacheck[1] - 2*Lambdacheck[2],
-Lambdacheck[1] - Lambdacheck[2], -2*Lambdacheck[1] + Lambdacheck[2]]
sage: R.root_lattice().roots()
[alpha[2], alpha[1], alpha[1] + alpha[2], -alpha[2], -alpha[1], -alpha[1]
- alpha[2]]
sage: R.weight_lattice().roots()
[-Lambda[1] + 2*Lambda[2], Lambda[1] + Lambda[2], 2*Lambda[1] - Lambda[2],
Lambda[1] - 2*Lambda[2], -Lambda[1] - Lambda[2], -2*Lambda[1] + Lambda[2]]
}}}
Florent
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4608#comment:2>
Sage <http://www.sagemath.org>
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