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Thomas Neidhart commented on MATH-1220: --------------------------------------- btw. is the implemented rejection method published anywhere? The most recent paper about sampling from a Zipf distribution that I could find is available here: http://epub.wu.ac.at/1176/ which refers to two older methods from Devroye and Dagpunar. > More efficient sample() method for ZipfDistribution > --------------------------------------------------- > > Key: MATH-1220 > URL: https://issues.apache.org/jira/browse/MATH-1220 > Project: Commons Math > Issue Type: Improvement > Reporter: Otmar Ertl > Attachments: patch_v1 > > > Currently, sampling from a ZipfDistribution is very inefficient. Random > values are generated by inverting the CDF. However, the current > implementation uses O(N) power function evaluations to calculate the CDF for > some point. (Here N is the number of points of the Zipf distribution.) I > propose to use rejection sampling instead, which allows the generation of a > single random value in constant time. -- This message was sent by Atlassian JIRA (v6.3.4#6332)