#16671: implement harmonic number function H(n,m)
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Reporter: rws | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.3
Component: symbolics | Resolution:
Keywords: special, log | Merged in:
Authors: Ralf Stephan | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/rws/implement_harmonic_number_function_h_n_m_|
0c93bfe4da1bd2b3a77865ae0a6878007726fff8
Dependencies: | Stopgaps:
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Comment (by rws):
Replying to [comment:9 nbruin]:
> Regular languages are not sufficient to describe expression languages
(the nested parentheses can't be expressed in a regular language--they
need a stack or something similar). Can't you get that conversion by
giving an appropriate `sage.symbolic.pynac.register_symbol`? then you get
to use the parentheses parser that is already in place.
Is there ready mechanics for this? I can't find one. Do you expect me to
implement it?
> you see that this should simply be
> {{{
> sage.functions.log.harmonic_number : lambda N,X : [[max_harmo],X,N],
> }}}
Thanks, included.
--
Ticket URL: <http://trac.sagemath.org/ticket/16671#comment:13>
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