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From "Gilles (JIRA)" <>
Subject [jira] [Commented] (MATH-1370) Increase efficiency of EnumeratedDistribution#probability
Date Tue, 31 May 2016 00:59:12 GMT


Gilles commented on MATH-1370:

bq. It would therefore break the added test on L47.

Something is not clear, since the unit passes, with my version too.

> Increase efficiency of EnumeratedDistribution#probability
> ---------------------------------------------------------
>                 Key: MATH-1370
>                 URL:
>             Project: Commons Math
>          Issue Type: Improvement
>            Reporter: Ryan Gaffney
>            Priority: Minor
>              Labels: patch, performance
>         Attachments: enum-distribution-perf-patch
> 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
> Original PR (incorrectly against master) [here|].

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