#15260: Integer division of reals and rationals
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Reporter: ncohen | Owner:
Type: defect | Status: needs_work
Priority: major | Milestone: sage-6.4
Component: basic arithmetic | Resolution:
Keywords: | Merged in:
Authors: Jan Keitel, | Reviewers: Jeroen Demeyer,
Jeroen Demeyer | Thierry Monteil
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jdemeyer/ticket/15260 | a7dde8bebc558d4f3a7cff9f6c26dab40e2ec55b
Dependencies: | Stopgaps:
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Changes (by jdemeyer):
* status: needs_info => needs_work
Comment:
Replying to [comment:18 tmonteil]:
> The condition `if not other != 0:` looks weird. For real interval
fields, why not using `other.contains_zero()` which is both easier to
understand and faster ?
Because I wanted something which behaves like `contains_zero()` but still
works for any kind of element (unfortunately, `__floordiv__` doesn't use
the coercion system).
> Concerning `FieldElement` it is very dangerous to return the usual
division, since it will silently fail when the field in a subset of the
reals for which we did not define a `__floordiv__` method:
>
> What about trying `(self/other).floor()` and raising a
`NotImplementedError` if the method does not exist ?
That's outside the scope of this ticket, but something like that could be
done in a new ticket or as part of #2034.
--
Ticket URL: <http://trac.sagemath.org/ticket/15260#comment:19>
Sage <http://www.sagemath.org>
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