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Posted to issues@commons.apache.org by "Luc Maisonobe (JIRA)" <ji...@apache.org> on 2016/01/01 14:20:39 UTC
[jira] [Resolved] (MATH-1285) Description API ZipfDistribution
[ https://issues.apache.org/jira/browse/MATH-1285?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Luc Maisonobe resolved MATH-1285.
---------------------------------
Resolution: Fixed
> Description API ZipfDistribution
> --------------------------------
>
> Key: MATH-1285
> URL: https://issues.apache.org/jira/browse/MATH-1285
> Project: Commons Math
> Issue Type: Improvement
> Environment: All
> Reporter: Pim van der Hoorn
> Priority: Minor
> Labels: easyfix
> Fix For: 4.0, 3.6
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> The description of the constructors for the ZipfDistribution class specifies an argument of type doule, called exponent. The documentation refers to a MathWorld page where the distribution is defined. However, here the exponent p, is the exponent of the cdf, not of the pdf (which is then p + 1). After running some test I found that the exponent in the constructor is the one for the pdf. This can create confusion among users. Therefore I recommend specifying in the documentation which exponent is meant.
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