#15542: Rounding weirdness when increasing the precision of a real number
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Reporter: | Owner:
mmezzarobba | Status: positive_review
Type: defect | Milestone: sage-duplicate/invalid/wontfix
Priority: major | Resolution:
Component: | Merged in:
numerical | Reviewers: Jeroen Demeyer
Keywords: | Work issues:
Authors: | Commit:
Report Upstream: N/A | Stopgaps:
Branch: |
Dependencies: |
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Comment (by zimmerma):
> At least the behaviour is intentional, so it's by definition not a bug.
then it should be documented somewhere. Where?
Also:
{{{
sage: a=RealField(53)(1.0e-20)
sage: a.exact_rational?
...
Returns the exact rational representation of this floating-point
number.
}}}
thus either {{{a}}} is **exactly** {{{10^(-20)}}}, and then
{{{exact_rational}}} should return that
value, or it is not, and {{{Reals(200)(a.exact_rational())}}} should
return {{{6646139978924579/664613997892457936451903530140172288}}}
Paul
--
Ticket URL: <http://trac.sagemath.org/ticket/15542#comment:8>
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