Opened 7 years ago
Closed 7 years ago
#1055 closed defect (fixed)
[with patch] Don't factor discriminant for quadratic number fields
Reported by: | robertwb | Owned by: | robertwb |
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Priority: | major | Milestone: | sage-2.8.12 |
Component: | number theory | Keywords: | |
Cc: | Merged in: | ||
Authors: | Reviewers: | ||
Report Upstream: | Work issues: | ||
Branch: | Commit: | ||
Dependencies: | Stopgaps: |
Description
The current implementation of quadratic number fields calculates the discriminant on initialization, which can be expensive and is unnecessary.
Elements are represented as a+b sqrt(D) / denom. I don't believe that we require D to be the discriminant, but this needs to be verified before a change is made. For efficiency reasons, it might be worth doing trial division to reduce squares of small prime powers from D, as smaller D yields faster arithmetic.
Attachments (1)
Change History (6)
comment:1 Changed 7 years ago by mabshoff
- Milestone set to sage-2.9
comment:2 Changed 7 years ago by was
- Milestone changed from sage-2.9.1 to sage-2.8.12
comment:3 Changed 7 years ago by robertwb
- Owner changed from was to robertwb
Changed 7 years ago by robertwb
comment:4 Changed 7 years ago by robertwb
- Status changed from new to assigned
- Summary changed from Don't factor discriminant for quadratic number fields to [with patch] Don't factor discriminant for quadratic number fields
comment:5 Changed 7 years ago by mabshoff
- Resolution set to fixed
- Status changed from assigned to closed
applied to 2.8.12.rc0
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easy to fix?