Opened 3 years ago
Closed 3 years ago
#27909 closed enhancement (fixed)
py3: fix a doctest in binary_form_reduce
Reported by:  ghmwageringel  Owned by:  

Priority:  major  Milestone:  sage8.8 
Component:  python3  Keywords:  
Cc:  bhutz  Merged in:  
Authors:  Markus Wageringel  Reviewers:  Ben Hutz 
Report Upstream:  N/A  Work issues:  
Branch:  569bf72 (Commits, GitHub, GitLab)  Commit:  569bf72103cc6678f4004f27d0210ceac178e437 
Dependencies:  Stopgaps: 
Description
This ticket fixes a Python 3 doctest failure in smallest_poly()
in sage.rings.polynomial.binary_form_reduce
.
In Python 3, the result of the function differs due to tiny floating point inaccuracies. I checked that the value that is minimized inside the function is the same in Python 2 and 3 (up to small tolerance), so apparently the result of the computation is not unique. In order to stay consistent between Python versions, I replaced the doctest by a test that checks the properties of the result instead of the result itself.
What I am not sure about: Does smallest_poly()
return the polynomial for which get_bound_poly()
attains its minimum? If so, perhaps this could be clarified in the documentation.
Change History (5)
comment:1 Changed 3 years ago by
 Branch set to u/ghmwageringel/27909
 Commit set to 6e576523aaf203e417612cb057249ff1a33d36b0
 Status changed from new to needs_review
comment:2 Changed 3 years ago by
 Cc bhutz added
comment:3 Changed 3 years ago by
 Commit changed from 6e576523aaf203e417612cb057249ff1a33d36b0 to 569bf72103cc6678f4004f27d0210ceac178e437
Branch pushed to git repo; I updated commit sha1. New commits:
569bf72  fix pyflakes in binary_form_reduce

comment:4 Changed 3 years ago by
 Reviewers set to Ben Hutz
 Status changed from needs_review to positive_review
This looks fine to me. The deletions all seem to be unused items that were missed when the original code was checked in.
comment:5 Changed 3 years ago by
 Branch changed from u/ghmwageringel/27909 to 569bf72103cc6678f4004f27d0210ceac178e437
 Resolution set to fixed
 Status changed from positive_review to closed
New commits:
Trac #27909: py3: fix doctest in smallest_poly()