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From "Ryan Gaffney (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MATH-1370) Increase efficiency of EnumeratedDistribution#probability
Date Mon, 30 May 2016 17:42:12 GMT
Ryan Gaffney created MATH-1370:
----------------------------------

             Summary: Increase efficiency of EnumeratedDistribution#probability
                 Key: MATH-1370
                 URL: https://issues.apache.org/jira/browse/MATH-1370
             Project: Commons Math
          Issue Type: Improvement
            Reporter: Ryan Gaffney
            Priority: Minor


There are lots of other low hanging fruit in the distribution package but unfortunately this
is the only one I got to that day.

In the EnumeratedDistribution case, the probability() method is currently O(N) where N denotes
number of random variables, even though the random variables are fixed / known. This change
makes probability() O(1). The unlikely worst case scenario now consumes slightly more than
2x the memory, but I do not think this would be an issue in the vast majority of cases.

Original PR (incorrectly against master) [here|https://github.com/apache/commons-math/pull/34].



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