#14115: missing log attribute for power series
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Reporter: chapoton | Owner: AlexGhitza
Type: defect | Status: new
Priority: minor | Milestone: sage-5.8
Component: algebra | Keywords: logarithm, power series
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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Consider the following
{{{
sage: x=PowerSeriesRing(QQ,'x').gen()
sage: x.exp()
1 + x + 1/2*x^2 + 1/6*x^3 + 1/24*x^4 + 1/120*x^5 + 1/720*x^6 + 1/5040*x^7
+ 1/40320*x^8 + 1/362880*x^9 + 1/3628800*x^10 + 1/39916800*x^11 +
1/479001600*x^12 + 1/6227020800*x^13 + 1/87178291200*x^14 +
1/1307674368000*x^15 + 1/20922789888000*x^16 + 1/355687428096000*x^17 +
1/6402373705728000*x^18 + 1/121645100408832000*x^19 + O(x^20)
sage: x.log()
AttributeError Traceback (most recent call
last)
...
AttributeError: 'sage.rings.power_series_poly.PowerSeries_poly' object has
no attribute 'log'
}}}
I think it would be good to have log if one has exp, in order to be able
to go back and forth. Of course, one should check that the constant term
is 1.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14115>
Sage <http://www.sagemath.org>
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