#10042: Doctest failure in sage/rings/polynomial/polynomial_element.pyx
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Reporter: mpatel | Owner: mvngu
Type: defect | Status: needs_work
Priority: blocker | Milestone: sage-4.6
Component: doctest | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: report upstream |
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Comment(by drkirkby):
If I'm not mistaken, the systems which are showing this problem are all
32-bit builds.
* 'fulvia', the Solaris 10 x86 system is using a 32-bit version of Sage,
despite the hardware is 64-bit
* 'hawk', my own personal !OpenSolaris machine is using a 32-bit version
of Sage, despite the hardware is 64-bit
* Cicero is a 32-bit Linux system - see http://wiki.sagemath.org/skynet
* Georg Weber's MAC is 32-bit.
Are there any counter examples? I believe John has built Sage on 'mark2'
without the failure. Although that's a 64-bit system, the binary is only
32-bit.
From what I understand, sqrt() should be the same on any IEEE 754 system.
However, the same is not true for pow(). It seems unlikely but perhaps one
root is being computed using sqrt(x) and the other pow(x,0.5).
Mathematically they are equal, but perhaps not on a computer with a finite
number of bits.
Since pi is irrational, this will never be able to be computed exactly
using floating point maths.
Dave
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10042#comment:42>
Sage <http://www.sagemath.org>
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