#1956: implement multivariate power series arithmetic
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Reporter: was | Owner: pernici
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-4.6.1
Component: commutative algebra | Keywords: multivariate power
series
Author: Niles Johnson | Upstream: N/A
Reviewer: Martin Albrecht, Simon King | Merged:
Work_issues: |
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Comment(by pernici):
Multivariate series in one variable differ from univariate series;
is it the intended behaviour?
{{{
sage: R = PowerSeriesRing(GF(127),'t');R
Power Series Ring in t over Finite Field of size 127
sage: %timeit R.random_element(100)
625 loops, best of 3: 856 µs per loop
sage: K = PowerSeriesRing(GF(127),1,'a'); K
Multivariate Power Series Ring in a over Finite Field of size 127
sage: %timeit K.random_element(100)
5 loops, best of 3: 146 ms per loop
}}}
I noticed this since
the patch trac_1956_faster_MPowerSeries_mul.patch does not work in this
case, because _send_to_bg calls the degrees method
{{{
sage: %timeit K.random_element(100)
AttributeError:
'sage.rings.polynomial.polynomial_zmod_flint.Polynomial_zmod_flint' object
has no attribute 'degrees'
}}}
If multivariate series in one variable are meant to differ from
univariate series I will modify _send_to_bg to deal with this case.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/1956#comment:64>
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