id,summary,reporter,owner,description,type,status,priority,milestone,component,resolution,keywords,cc,merged,author,reviewer,upstream,work_issues,branch,commit,dependencies,stopgaps
5338,"Sage 3.2.2: speed regression/infinite loop for ""K.** = QQ[a]""",mabshoff,tbd,"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.**** = 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",defect,closed,critical,sage-4.3,algebra,fixed,,robertwb,sage-4.3.alpha1,William Stein,Robert Bradshaw,N/A,,,,,
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