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]""" Michael Abshoff 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 Robert Bradshaw sage-4.3.alpha1 William Stein Robert Bradshaw N/A
**