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https://issues.apache.org/jira/browse/MATH-178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12561530#action_12561530
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Paul Cowan commented on MATH-178:
---------------------------------
Further to this: there's an interesting definition at
http://functions.wolfram.com/GammaBetaErf/HarmonicNumber2/03/01/01/0008/ which
is based on polygamma (there's an implementation of THAT in Gnu GSL? Not sure
if that's useful?) but that in turn requires calculating the factorial of the
exponent (which is in turn slow, though easily cacheable) and also requires
restricting the exponent to a natural number, which is fine for us but may make
the ZipfDistribution less useful for others.
> Implement Zipf distribution
> ---------------------------
>
> Key: MATH-178
> URL: https://issues.apache.org/jira/browse/MATH-178
> Project: Commons Math
> Issue Type: New Feature
> Reporter: Paul Cowan
> Priority: Minor
> Attachments: ZipfDistribution.patch, ZipfDistribution2.patch
>
>
> Per my post to commons-dev --
> http://mail-archives.apache.org/mod_mbox/commons-dev/200801.mbox/[EMAIL
> PROTECTED] -- I'd like to propose adding a Zipf distribution to commons-math.
> I have a patch, but it's incomplete and somewhat inefficient; I'd like to
> throw it up for discussion though. To follow.
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