#15921: work around Maxima fpprintprec bug and other ARM-specific problems
-------------------------------------+-------------------------------------
Reporter: dimpase | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.3
Component: calculus | Resolution:
Keywords: Maxima, | Merged in:
fpprintprec, ARM | Reviewers:
Authors: | Work issues:
Report Upstream: Reported | Commit:
upstream. Developers acknowledge | 079bb9af4f12892268a19f0d218ac96bd72466f4
bug. | Stopgaps:
Branch: |
u/dimpase/arm_fixes_etc |
Dependencies: |
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Comment (by dimpase):
Replying to [comment:11 pbruin]:
> Now I don't know if this is what behind your observation; at least the
output of `elliptic_e()` seems to be a `RealNumber`, not a `RealLiteral`.
>
on different platforms Maxima's `elliptic_e()` outputs different number of
digits.
{{{
Maxima on ARM:
(%i1) elliptic_e(0.5, 0.1);
(%o1) .4980113944988315
as compared to x86_64:
(%i1) elliptic_e(0.5, 0.1);
(%o1) .49801139449883153
}}}
(and Maxima with different Lisps does different things on the same
platform, too - in some case just 14 digits...)
Actually, as you mention, on `x86_64` the number of digits is too big for
`RealField(53)`. I have no idea whether this is handled gracefully by
Sage, or not.
> Yes, but I'd say the same holds for the `RealField(prec)(0.123)`
solution... I tend towards `# abs tol`/`# rel tol` as the least invasive
solution, although that could also hide precision bugs.
Well, it is a mess anyway. I'd be glad to have it off my shoulders one way
or another.
--
Ticket URL: <http://trac.sagemath.org/ticket/15921#comment:12>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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