#15337: Speed up ulp() method of real_mpfr.pyx
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Reporter: jdemeyer | Owner:
Type: enhancement | Status: needs_review
Priority: minor | Milestone: sage-5.13
Component: basic arithmetic | Resolution:
Keywords: | Merged in:
Authors: Jeroen Demeyer | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by jdemeyer:
Old description:
> Before:
> {{{
> sage: a=RealField(10**6).one(); timeit('a.ulp()')
> 625 loops, best of 3: 42.9 µs per loop
> }}}
>
> After:
> {{{
> sage: a=RealField(10**6).one(); timeit('a.ulp()')
> 625 loops, best of 3: 6.13 µs per loop
> }}}
New description:
Before:
{{{
sage: a=RealField(10**6).one(); timeit('a.ulp()')
625 loops, best of 3: 42.9 µs per loop
}}}
After:
{{{
sage: a=RealField(10**6).one(); timeit('a.ulp()')
625 loops, best of 3: 6.13 µs per loop
}}}
The patch also adds a `field` argument, which can be used to result in a
different `RealField`. It also adds a related `epsilon()` method, defined
as ``a.epsilon() = a/2^a.precision()``.
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Ticket URL: <http://trac.sagemath.org/ticket/15337#comment:14>
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