#16201: default precision for symbolic power series from SR.series()
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Reporter: rws | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.2
Component: algebra | Keywords: series precision
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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Both Laurent and power series ring elements have a default precision of
20. OTOH, symbolic series expansions need the precision set:
{{{
sage: R.<t> = LaurentSeriesRing(QQ)
sage: 1/(1-t)
1 + t + t^2 + t^3 + t^4 + t^5 + t^6 + t^7 + t^8 + t^9 + t^10 + t^11 + t^12
+ t^13 + t^14 + t^15 + t^16 + t^17 + t^18 + t^19 + O(t^20)
sage: var('x')
x
sage: ex=1/(1-x)
sage: ex.series(x)
...
TypeError: series() takes exactly 2 positional arguments (1 given)
}}}
This ticket proposes to unify the behaviour by allowing the following:
{{{
sage: ex.series(x)
1 + 1*x + 1*x^2 + 1*x^3 + 1*x^4 + 1*x^5 + 1*x^6 + 1*x^7 + 1*x^8 + 1*x^9 +
1*x^10 + 1*x^11 + 1*x^12 + 1*x^13 + 1*x^14 + 1*x^15 + 1*x^16 + 1*x^17 +
1*x^18 + 1*x^19 + Order(x^20)
}}}
As this is about reducing surprise for the user both algebra and symbolic
series default precision should have the same value, so the ticket should
also implement such a global value.
--
Ticket URL: <http://trac.sagemath.org/ticket/16201>
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