#18670: Use abs() to test for accuracy of roots of complex-valued functions
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Reporter: strogdon | Owner:
Type: defect | Status: new
Priority: blocker | Milestone: sage-6.8
Component: doctest coverage | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by strogdon):
With sage-6.8.beta3 installed I have the following failure:
{{{
sage -t --long src/sage/rings/polynomial/polynomial_element.pyx
**********************************************************************
File "src/sage/rings/polynomial/polynomial_element.pyx", line 5577, in
sage.rings.polynomial.polynomial_element.Polynomial.roots
Failed example:
f(f.roots()[0][0]) # abs tol 1e-13
Expected:
3.3306690738754696e-15 + 1.3704315460216776e-15*I
Got:
1.1102230246251565e-16*I
**********************************************************************
1 item had failures:
1 of 177 in sage.rings.polynomial.polynomial_element.Polynomial.roots
[1752 tests, 1 failure, 17.15 s]
----------------------------------------------------------------------
sage -t --long src/sage/rings/polynomial/polynomial_element.pyx # 1
doctest failed
----------------------------------------------------------------------
}}}
There may be similar failures on other architectures. I have
{{{
uname -a
Linux ledaig 3.6.11-gentoo #6 SMP Mon Aug 25 17:39:25 CDT 2014 x86_64
Dual-Core AMD Opteron(tm) Processor 2218 AuthenticAMD GNU/Linux
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/18670#comment:1>
Sage <http://www.sagemath.org>
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