Fix more noise on MacOS X 10.4 PPC

[nexttime]

This is a follow-up to #7852 (and #11897).

As reported on sage-release, some doctests in Sage 4.7.2.alpha3 still failed on a PowerPC running MacOS X 10.4 due to numerical noise (or slightly different behaviour, giving correct but varying results).

The patch here further increases the threshold for noisy zero terms of polynomials slightly.

---

Apply

1. attachment: trac_11901-adjust_threshold_for_noisy_zero_terms_in_polynomial_element.patch
   to the Sage library.

CC: @kcrisman @rbeezer

Component: linear algebra

Keywords: noisy zero epsilon threshold polynomial term

Author: Leif Leonhardy

Reviewer: Karl-Dieter Crisman, Rob Beezer

Merged: sage-4.7.2.alpha4

Issue created by migration from https://trac.sagemath.org/ticket/11901

[nexttime]

Sage library patch. Based on Sage 4.7.2.alpha3 / #7852.

[nexttime]

comment:1

Attachment: trac_11901-adjust_threshold_for_noisy_zero_terms_in_polynomial_element.patch.gz

A single-character patch to be tested (by "student") and reviewed...

[nexttime]

Author: Leif Leonhardy

[rbeezer]

comment:2

This looks good to me, but I think we need to see if it does the job on Mac PowerPC?

[kcrisman]

comment:3

I know this is sort of silly, but it is nice to have all tests pass :)

Works fine.

sage -t -long "devel/sage/sage/rings/polynomial/polynomial_element.pyx"
         [156.8 s]
 
----------------------------------------------------------------------
All tests passed!
Total time for all tests: 157.4 seconds

[kcrisman]

Reviewer: Karl-Dieter Crisman, Rob Beezer

[jdemeyer]

Merged: sage-4.7.2.alpha4

[jdemeyer]

comment:4

Thanks!

[nexttime]

comment:5

Replying to @jdemeyer:

Thanks!

So Moufang is still alive?

[jdemeyer]

comment:6

Replying to @nexttime:

So Moufang is still alive?

Of course. Did I ever say it wasn't? I don't actually use this machine, only to test Sage.