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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4437) Use qMC sequence to improve the accuracy of PiEstimator
Date Tue, 04 Nov 2008 01:01:44 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-4437?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Tsz Wo (Nicholas), SZE updated HADOOP-4437:

    Attachment: 4437_20081103.patch

4437_20081103.patch: added javadoc, no code changes.

> Use qMC sequence to improve the accuracy of PiEstimator
> -------------------------------------------------------
>                 Key: HADOOP-4437
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4437
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: examples
>            Reporter: Tsz Wo (Nicholas), SZE
>            Priority: Minor
>             Fix For: 0.20.0
>         Attachments: 4437_20081019.patch, 4437_20081103.patch
> Currently, PiEstimator uses java.util.Random to generate random 2d-points for estimating
pi. The numbers generated by java.util.Random are uniformly distributed.  The 2d-points generated
tense to have clump and gap. So the accuracy of the estimated pi is low.  The accuracy can
be improved by using a quasi-Monte Carlo (qMC) sequence.

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