#26872 closed defect (fixed)
Implement abs and sqrt for UniversalCyclotomicField elements
Reported by: | slelievre | Owned by: | |
---|---|---|---|
Priority: | major | Milestone: | sage-8.6 |
Component: | number fields | Keywords: | UniversalCyclotomicField, universal cyclotomic field |
Cc: | slelievre, vdelecroix, tscrim | Merged in: | |
Authors: | Frédéric Chapoton | Reviewers: | Travis Scrimshaw |
Report Upstream: | N/A | Work issues: | |
Branch: | db44a9e (Commits) | Commit: | |
Dependencies: | #26875 | Stopgaps: |
Description (last modified by )
Inspired by this report by Ask Sage user Assombrance:
For abs, we need to implement __abs__
for elements of the universal
cyclotomic field; it could be computed as the square root of z * z.conjugate()
or of z.real()**2 + z.imag()**2
, or by using to_cyclotomic_field
, or by
changing ring to QQbar
.
Change History (8)
comment:1 Changed 8 months ago by
- Cc slelievre vdelecroix added
- Description modified (diff)
- Keywords universal cyclotomic field added
- Summary changed from Implement abs for UniversalCyclotomicField elements to Implement abs and sqrt for UniversalCyclotomicField elements
comment:2 Changed 7 months ago by
- Branch set to u/chapoton/26872
- Commit set to db44a9e75ce0ae0b9c4ea55720fadfdc8822d112
- Status changed from new to needs_info
comment:3 Changed 7 months ago by
- Dependencies set to #26875
comment:4 Changed 7 months ago by
- Cc tscrim added
- Status changed from needs_info to needs_review
green bot, so this seems to be ready for review
comment:5 Changed 7 months ago by
- Reviewers set to Travis Scrimshaw
- Status changed from needs_review to positive_review
This will work well as a first implementation. If we need to optimize either of these operations later on, then we can do it then.
comment:6 Changed 7 months ago by
- Branch changed from u/chapoton/26872 to db44a9e75ce0ae0b9c4ea55720fadfdc8822d112
- Resolution set to fixed
- Status changed from positive_review to closed
comment:7 Changed 7 months ago by
- Commit db44a9e75ce0ae0b9c4ea55720fadfdc8822d112 deleted
- Milestone changed from sage-8.5 to sage-8.6
comment:8 Changed 6 months ago by
Oops. The method should have been called __abs__
rather than abs
.
Follow-up at #27201.
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New commits:
new method "is_integral" for elements of universal cyclotomic field
trac 26872 adding abs and sqrt to universal cyclotomic field