#8972: Inversion and fraction fields for power series rings
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Reporter: SimonKing | Owner: AlexGhitza
Type: defect | Status: needs_review
Priority: major | Milestone: sage-4.4.2
Component: algebra | Keywords: power series ring, fraction field
Author: Simon King | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by SimonKing):
Replying to [comment:6 robertwb]:
> I'm wary of such a big change until we have some timing tests in place.
In particular, I'm worried about potential slowdowns in the Monsky-
Washnitzer code.
You are right, timing should be taken into account, and this is something
my patch doesn't provide. Without the patch:
{{{
sage: R.<x> = ZZ[[]]
sage: timeit('a=1/(1+x)')
625 loops, best of 3: 1.08 ms per loop
}}}
With the patch
{{{
sage: R.<x> = ZZ[[]]
sage: timeit('a=1/(1+x)')
125 loops, best of 3: 6 ms per loop
}}}
So, it is slower by more than a factor five.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8972#comment:7>
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