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Date: Sun, 25 Nov 2012 23:38:58 +0000 (UTC)
From: "Patrick Meyer (JIRA)" <jira@apache.org>
To: issues@commons.apache.org
Message-ID: <1543210504.21693.1353886738381.JavaMail.jiratomcat@arcas>
Subject: [jira] [Created] (MATH-909) FDistribution NoBracketingException in
 BrentSolver
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Patrick Meyer created MATH-909:
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             Summary: FDistribution NoBracketingException in BrentSolver
                 Key: MATH-909
                 URL: https://issues.apache.org/jira/browse/MATH-909
             Project: Commons Math
          Issue Type: Bug
    Affects Versions: 3.0
            Reporter: Patrick Meyer


I get an exception when running the code below. the exception is=20

{code}
function values at endpoints do not have different signs, endpoints: [0, 1.=
002], values: [-0.025, -=E2=88=9E]
{code}

The problematic code:

{code}
double df1 =3D 10675;
double df2 =3D 501725;
FDistribution fDist =3D new FDistribution(df1, df2);       System.out.print=
ln(fDist.inverseCumulativeProbability(0.025));//NoBracketingException
{code}

However, R returns the value 0.9733505. The R code is:
{code}
qf(p=3D.025, df1=3D10675, df2=3D501725)
{code}

I don't know enough about the FDistribution class to know the solution to t=
he exception, but I thought I would report it.


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