#19910: degree is very slow on QQbar
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Reporter: zimmerma | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.1
Component: basic arithmetic | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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consider this with Sage 6.10:
{{{
sage: b=(QQ['x'](x^17-x+1)).roots(QQbar)[0][0]
sage: a=(QQ['x'](x^3-x+1)).roots(QQbar)[0][0]
sage: a.degree()
3
sage: b.degree()
17
sage: a
-1.324717957244746?
sage: b
-1.042917732301787?
sage: a+b
-2.367635689546533?
sage: %time (a+b).degree()
CPU times: user 3.65 s, sys: 0 ns, total: 3.65 s
Wall time: 3.64 s
51
}}}
Why does it takes more than 3 seconds to compute {{{3*17}}}?
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Ticket URL: <http://trac.sagemath.org/ticket/19910>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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