Opened 5 years ago
Closed 5 years ago
#17955 closed defect (fixed)
LaurentSeriesRing and series_precision
Reported by: | behackl | Owned by: | |
---|---|---|---|
Priority: | trivial | Milestone: | sage-6.6 |
Component: | commutative algebra | Keywords: | series_precision, asymptotics |
Cc: | Merged in: | ||
Authors: | Benjamin Hackl | Reviewers: | Ralf Stephan |
Report Upstream: | N/A | Work issues: | |
Branch: | 13b1867 (Commits) | Commit: | 13b1867998e2f1f172ffd9cb576e3ba4e8298735 |
Dependencies: | Stopgaps: |
Description
Currently, LaurentSeriesRing
caches without replacing the default default_prec=None
to the global series precision obtainable by sage.default.series_precision()
. This leads to the following behavior:
sage: set_series_precision(5) sage: R.<x> = LaurentSeriesRing(ZZ) sage: 1/(1-x) 1 + x + x^2 + x^3 + x^4 + O(x^5) sage: set_series_precision(3) sage: R.<x> = LaurentSeriesRing(ZZ) sage: 1/(1-x) 1 + x + x^2 + x^3 + x^4 + O(x^5)
Instead, the (second) output should be
sage: 1/(1-x) 1 + x + x^2 + O(x^3)
This is fixed by setting default_prec
to the corresponding global series precision *before* caching the parent.
Change History (3)
comment:1 Changed 5 years ago by
- Branch set to u/behackl/laurent_series_precision
- Commit set to 13b1867998e2f1f172ffd9cb576e3ba4e8298735
- Priority changed from major to trivial
- Status changed from new to needs_review
comment:2 Changed 5 years ago by
- Component changed from symbolics to commutative algebra
- Reviewers set to Ralf Stephan
- Status changed from needs_review to positive_review
comment:3 Changed 5 years ago by
- Branch changed from u/behackl/laurent_series_precision to 13b1867998e2f1f172ffd9cb576e3ba4e8298735
- Resolution set to fixed
- Status changed from positive_review to closed
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Is fine and passes all tests in
rings/
anddoc/
. Thanks for spotting this.