#15921: work around Maxima fpprintprec bug and other ARM-specific problems
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Reporter: dimpase | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.2
Component: calculus | Resolution:
Keywords: Maxima, | Merged in:
fpprintprec, ARM | Reviewers:
Authors: | Work issues:
Report Upstream: Reported | Commit:
upstream. Developers acknowledge | 7c532abee02b2c1e5005da408fb6420fc2dece89
bug. | Stopgaps:
Branch: |
u/dimpase/arm_fixes |
Dependencies: |
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Changes (by dimpase):
* commit: => 7c532abee02b2c1e5005da408fb6420fc2dece89
* branch: => u/dimpase/arm_fixes
Old description:
> [https://groups.google.com/d/msg/sage-devel/oRpkswzpK38/rNVbVN2RyEcJ
> Maxima uses CL FORMAT function wrongly], resulting in outputting wrong
> number of digits for floats (one extra), and
> contradicting its own manual on fpprintprec. In particular it outputs too
> many digits on ix86 and ix86_64, which got in Sage's doctests. As a
> result, doctests fail on ARM.
>
> The fix is to replace the extra digit in doctests by dot.
New description:
[https://groups.google.com/d/msg/sage-devel/oRpkswzpK38/rNVbVN2RyEcJ
Maxima uses CL FORMAT function wrongly], resulting in outputting wrong
number of digits for floats (one extra), and
contradicting its own manual on fpprintprec. In particular it outputs too
many digits on ix86 and ix86_64, which got in Sage's doctests. As a
result, doctests fail on ARM.
The fixes are to convert the results into `RealField(prec)`, with
appropriate `prec`
(at least 54, or sometimes more). This ticket also fixes ARM-specific
numerical noise stemming
from various other upstream problems, such as `eglibc` loss of precision
in `lgamma`.
--
Comment:
New commits:
||[http://git.sagemath.org/sage.git/commit/?id=7c532abee02b2c1e5005da408fb6420fc2dece89
7c532ab]||{{{Merge branch 'develop' of trac.sagemath.org:sage into
arm_fixes}}}||
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Ticket URL: <http://trac.sagemath.org/ticket/15921#comment:1>
Sage <http://www.sagemath.org>
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