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Gilles Sadowski updated MATH-1370: ---------------------------------- Fix Version/s: (was: 4.0) 4.X > 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 > Labels: patch, performance > Fix For: 4.X > > Attachments: enum-distribution-perf-patch, > enum-distribution-perf-patch.2 > > > 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]. -- This message was sent by Atlassian Jira (v8.3.4#803005)