Paul Cowan a écrit :
Hi all,
I'd like to propose adding a Zipf (or Zipfian) integer distribution to
commons-math.
The Zipf distribution is a distribution which (approximately) reflects
many 'real-world' phenomena, e.g. the frequency of use of words in a
language.
This is a good idea.
I have a patch available, including test case; per
http://commons.apache.org/math/developers.html, I will add it to the
wishlist and to Bugzilla (or Jira? I gather commons math uses Jira now
but the page still says Bugzilla) and attach my patch if the response
here is generally positive to the idea.
You should open a ticket in Jira.
We are currently working on the 1.2 release. This addition will not be
included in this release. The next one will be 2.0.
Note that the patch isn't perfect; in particular I've just stuck a
method to calculate generalized harmonic numbers in the
ZipfDistributionImpl class itself. I would suggest that a) it almost
certainly shouldn't go there, and b) it could most certainly be done
more efficiently (I'm using a simple cumulative loop), but I would like
guidance on solving both of those issues from people who know the
project and are better than me at mathematics (respectively).
This will be discussed in the Jira comments system.
Thanks
Luc
Cheers,
Paul Cowan.
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