#15673: major improvements to lazy power series
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Reporter: mhansen | Owner:
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-6.4
Component: combinatorics | Resolution:
Keywords: LazyPowerSeries,, | Merged in:
days57 | Reviewers: Ralf Stephan,
Authors: Mike Hansen | Matthieu Dien
Report Upstream: N/A | Work issues:
Branch: u/mantepse/15673 | Commit:
Dependencies: | aa8fd83522eaeb583da0caa5c6628ddd1ed36b04
| Stopgaps:
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Comment (by mantepse):
Replying to [comment:47 elixyre]:
> I have a stupid question: the ''lazy'' thing is a trick to compute
efficiently the coefficient of the product of series or some other
operations on series, right?
No. The laziness is for having potentially infinite sequences.
> About the code, why does `LazyPowerSeries` only inherit of
`AlgebraElement` and not of `Stream`?
Unless I misunderstand python's inheritance, the point is that a
`LazyPowerSeries` should not have the methods of it's stream of
coefficients.
My current plan is to remove {{{Stream}}} entirely, rename
{{{SeriesStream}}} to {{{CoefficientStream}}} and make the latter into a
ring module, which uses the new {{{lazy_list}}}, or, once that is in
place, Daniel Krenn's {{{InfiniteSequence}}}.
--
Ticket URL: <http://trac.sagemath.org/ticket/15673#comment:48>
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