#12241: exp, log, derivative of multivariate power series
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Reporter: vbraun | Owner: malb
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.0
Component: commutative algebra | Keywords: multivariate power series
Work_issues: efficiency | Upstream: N/A
Reviewer: Niles Johnson | Author: Volker Braun
Merged: | Dependencies:
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Changes (by vbraun):
* status: needs_work => needs_review
Comment:
I've removed the `pow()` method and sped up log/exp:
{{{
sage: R.<a,b,c> = PowerSeriesRing(ZZ)
sage: f = 1+R.random_element(30); f
1 - a^8*b^2*c^3 + 2*a*b^6*c^8 - 3*a^2*b^16*c - 17*a^13*b^3*c^8 +
2*a^2*b^8*c^15 + O(a, b, c)^30
sage: %timeit log(f)
125 loops, best of 3: 3.6 ms per loop
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12241#comment:4>
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