#15079: unique_round for RIF
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Reporter: dkrenn | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.13
Component: basic arithmetic | Resolution:
Keywords: rif, floor, ceil, round | Merged in:
Authors: Daniel Krenn | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Changes (by dkrenn):
* status: needs_work => needs_review
Old description:
> {{{RIF}}}-element has already {{{.unique_floor}}} and {{{.unique_ceil}}}
> and now has a {{{.unique_round}}}
>
> Apply: trac_15079_unique_round.patch
New description:
{{{RIF}}}-element has already {{{.unique_floor}}} and {{{.unique_ceil}}}
and now has a {{{.unique_round}}}
Apply: trac_15079_unique_round.2.patch
--
Comment:
Replying to [comment:2 jdemeyer]:
> Why make a special case for `self < 0`?
Since {{{RIF(-1/2).unique_round()}}} should give {{{-1}}}.
> This is bad:
> {{{
> sage: RIF(-1/2,-1/3).unique_round()
> ...
> ValueError: interval does not have a unique round (nearest integer)
> sage: RIF(-1/2,1/3).unique_round()
> 0
> }}}
> If an interval doesn't have a unique round, a larger interval certainly
should not have a unique round.
Corrected and tests added.
--
Ticket URL: <http://trac.sagemath.org/ticket/15079#comment:3>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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