#9138: Categories for polynomial rings
-----------------------------------------+----------------------------------
Reporter: jbandlow | Owner: nthiery
Type: defect | Status: needs_work
Priority: major | Milestone: sage-4.7
Component: categories | Keywords: introspection,
categories for rings
Author: Simon King | Upstream: N/A
Reviewer: | Merged:
Work_issues: Improve Monsky-Washnitzer |
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Changes (by SimonKing):
* status: needs_review => needs_work
* work_issues: Doctest errors => Improve Monsky-Washnitzer
Comment:
I see that there is a lot of slow-down in the Monsky-Washnitzer code,
namely arithmetic in `SpecialCubicQuotientRing`:
{{{
sage: B.<t> = PolynomialRing(Integers(125))
sage: R = monsky_washnitzer.SpecialCubicQuotientRing(t^3 - t + B(1/4))
sage: x, T = R.gens()
sage: x
(0) + (1)*x + (0)*x^2
sage: T
(T) + (0)*x + (0)*x^2
}}}
In vanilla sage-4.6.2, I get
sage: timeit('x*T')
625 loops, best of 3: 491 µs per loop
}}}
With the patches, I get
{{{
sage: timeit('x*T')
625 loops, best of 3: 612 µs per loop
}}}
So, there is your problem!
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9138#comment:28>
Sage <http://www.sagemath.org>
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