#15698: conversion from polynomial fraction to its power series expansion
-------------------------------------+-------------------------------------
Reporter: rws | Owner: rws
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.2
Component: algebra | Resolution:
Keywords: power series, | Merged in:
expansion, fraction | Reviewers: Marc Mezzarobba
Authors: Ralf Stephan, | Work issues:
Marc Mezzarobba | Commit:
Report Upstream: N/A | 25f819f748f64634177097da20cc9bbf1c2a68df
Branch: | Stopgaps:
u/mmezzarobba/15698-series_of_ratpoly|
Dependencies: |
-------------------------------------+-------------------------------------
Changes (by mmezzarobba):
* status: needs_work => needs_review
Comment:
Replying to [comment:25 rws]:
> Patchbot says:
> {{{
> File "src/sage/rings/power_series_ring.py", line 671, in
sage.rings.power_series_ring.PowerSeriesRing_generic._element_constructor_
> Failed example:
> PowerSeriesRing(PowerSeriesRing(QQ,'x'),'y')(1/(1+x), 5)
> Expected:
> 1 - x + x^2 - x^3 + x^4 + O(x^5)
> Got:
> 1 - x + x^2 - x^3 + x^4 - x^5 + x^6 - x^7 + x^8 - x^9 + x^10 - x^11
+ x^12 - x^13 + x^14 - x^15 + x^16 - x^17 + x^18 - x^19 + O(x^20) + O(y^5)
> }}}
Thanks. That was a stupid copy-paste mistake, I believe.
----
New commits:
||[http://git.sagemath.org/sage.git/commit/?id=c52306876a62ab3fc8a40b7388823b9a2035948c
c523068]||{{{15698: Allow construction of power series from fractions}}}||
||[http://git.sagemath.org/sage.git/commit/?id=f38e82fb0c93ca5225c04edd1be7951558d2dcc5
f38e82f]||{{{Fraction to power series conversion when the fraction coerces
into the base ring}}}||
||[http://git.sagemath.org/sage.git/commit/?id=25f819f748f64634177097da20cc9bbf1c2a68df
25f819f]||{{{Fraction to power series: doctests}}}||
--
Ticket URL: <http://trac.sagemath.org/ticket/15698#comment:28>
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