#5338: Sage 3.2.2: speed regression/infite loop for "K.<b> = QQ[a]"
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Reporter: mabshoff | Owner: tbd
Type: defect | Status: new
Priority: critical | Milestone: sage-3.4
Component: algebra | Keywords:
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The code below works instantly in Sage 3.2.1, but starting with Sage 3.2.2
it doesn't even finish the last command in 30 minutes CPU time:
{{{
----------------------------------------------------------------------
| Sage Version 3.2.2, Release Date: 2008-12-18 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
sage: sage: x = var('x')
sage: sage: eqn = x^3 + sqrt(2)*x + 5 == 0
sage: sage: a = solve(eqn, x)[0].rhs()
sage: sage: K.<b> = QQ[a]
}}}
Carl Witty suggests:
{{{
[10:23am] mabs: So far it has eaten *4 minutes* of CPU time.
[10:23am] cwitty: It looks like somebody changed the embedding
system to use QQbar instead of wstein's algdep-of-numerical-value.
}}}
This is likely related to the new embedding code in Sage 3.2.2, so I am
CCing RobertWB.
Cheers,
Michael
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5338>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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