#6441: [with patch, needs work] Charpoly (plus adjoint and det)
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Reporter: spancratz | Owner: somebody
Type: defect | Status: new
Priority: major | Milestone: sage-4.1.2
Component: linear algebra | Keywords: charpoly,
division-free
Reviewer: Rob Beezer, Yann Laigle-Chapuy | Author: Sebastian Pancratz
Merged: |
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Comment(by rbeezer):
Replying to [comment:38 spancratz]:
> I hadn't even heard about the "-long" tests.
Sorry, my fault. First time it got me as well.
> I take it I only need to look at the first few problems and not the
known failures, right?
Yes, you can expect those other failures, but they are not yours to deal
with.
> I've already checked that they definitely are "just" numerical noise,
running the methods in question with the parameter "prec" in {10,20,30}
gave answers 0.95, 1.0001, 0.99999994, respectively. However, I think the
right way to fix this is not to change the doctests, but to pass the
parameter algorithm="hessenberg" at the appropriate place to ensure that
the behaviour isn't changed. I'll look into this probably tomorrow.
Sounds good.
Rob
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6441#comment:39>
Sage <http://sagemath.org/>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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