#8666: Bug in cyclotomic linear algebra
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Reporter: craigcitro | Owner: AlexGhitza
Type: defect | Status: new
Priority: blocker | Milestone: sage-4.4
Component: algebra | Keywords:
Author: Craig Citro, Robert Bradshaw | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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David Loeffler ran into this bug:
{{{
sage: K.<zeta4> = CyclotomicField(4)
sage: m = matrix(K, [186])
sage: n = matrix(K, [125])
sage: m * n
[-23087]
}}}
(See http://groups.google.com/group/sage-
devel/browse_thread/thread/4f8633d6acf1c4ef# for the full thread.)
The issue is that the bound for what modulus the entries can be computed
modulo is off by a factor of 2, because it doesn't take the sign into
consideration. (Amusingly, this was basically the same fix as in #4823.)
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8666>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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