#15114: disallow coercions from RR to RIF
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Reporter: mstreng | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-5.12
Component: coercion | Resolution:
Keywords: RIF RR interval coercion | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Changes (by vdelecroix):
* cc: vdelecroix (added)
Old description:
> Remove the following coercions because they make interval arithmetic much
> less trustworthy.
> * RR --> RIF
> * CC --> CIF
> * RealField --> RealIntervalField
> * ComplexField --> ComplexIntervalField
>
> For example, one could easily do the following by accident.
> {{{
> sage: iv = 1 + 2^(-55) + 0. + RIF(1)
> sage: iv.lower(), iv.upper()
> (2.00000000000000, 2.00000000000000)
> }}}
>
> See also [https://groups.google.com/forum/#!topic/sage-devel/zfg0PhFR_qA
> this topic on sage-devel]
New description:
Remove the following coercions because they make interval arithmetic much
less trustworthy.
* `RR` --> `RIF`
* `CC` --> `CIF`
* `RealField` --> `RealIntervalField`
* `ComplexField` --> `ComplexIntervalField`
For example, one could easily do the following by accident.
{{{
sage: iv = 1 + 2^(-55) + 0. + RIF(1)
sage: iv.lower(), iv.upper()
(2.00000000000000, 2.00000000000000)
}}}
See also [https://groups.google.com/forum/#!topic/sage-devel/zfg0PhFR_qA
this topic on sage-devel]
--
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Ticket URL: <http://trac.sagemath.org/ticket/15114#comment:1>
Sage <http://www.sagemath.org>
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