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From "Martin Illecker (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HAMA-905) Fix Pi Estimator Example
Date Mon, 19 May 2014 14:16:38 GMT
Martin Illecker created HAMA-905:
------------------------------------

             Summary: Fix Pi Estimator Example
                 Key: HAMA-905
                 URL: https://issues.apache.org/jira/browse/HAMA-905
             Project: Hama
          Issue Type: Bug
          Components: examples
    Affects Versions: 0.6.4
            Reporter: Martin Illecker
            Priority: Minor
             Fix For: 0.7.0


*Fix Pi Estimator Example*

I think we should skip the *sqrt* method in \[1] and change the if condition based on formula
6 on page 2 in \[2]. 

{code}
IF (x^2 + y^2 <= 1) THEN
 SUM = SUM +1
END IF
{code}

Because the Equation of the Circle is 
{code}
x^2 + y^2 = r^2
x^2 + y^2 = 1 (with r=1 in unit circle)
-> (x^2 + y^2 <= 1)
{code}

Thanks!

\[1] https://github.com/apache/hama/blob/trunk/examples/src/main/java/org/apache/hama/examples/PiEstimator.java#L62-64
\[2] http://arxiv.org/pdf/1404.1499v2.pdf



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