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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 37019] New: - NaN handling in StatsUtil.min, StatsUtil.max methods
Date Tue, 11 Oct 2005 11:58:32 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=37019

           Summary: NaN handling in StatsUtil.min, StatsUtil.max methods
           Product: Commons
           Version: 1.0 Final
          Platform: PC
        OS/Version: Windows 2000
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Math
        AssignedTo: commons-dev@jakarta.apache.org
        ReportedBy: Mark.Osborn@research.ge.com


Data with NaN appears to be incorrectly handled in some cases when calculating 
min and max using StatsUtil package. See examples below:

data={NaN, 4.0, 5.0, NaN}
max (Apache)=NaN <-- correct.
min (Apache)=NaN <-- correct.

data={4.0, 5.0, NaN}
max (Apache)=NaN <-- correct.
min (Apache)=NaN <-- correct.

data={4.0, 5.0, 7.0}
max (Apache)=7.0 <-- correct.
min (Apache)=4.0 <-- correct.

data={NaN, 4.0, 5.0}
max (Apache)=5.0 <-- incorrect? NaN.
min (Apache)=4.0 <-- incorrect? NaN.

data={2.2343, NaN, NaN, 3435.32}
max (Apache)=3435.32 <-- incorrect? NaN.
min (Apache)=3435.32 <-- incorrect? NaN.

data={3435.32, NaN, NaN, 2.2343}
max (Apache)=2.2343 <-- incorrect? NaN.
min (Apache)=2.2343 <-- incorrect? NaN.

data={NaN, NaN, NaN}
max (Apache)=NaN <-- correct.
min (Apache)=NaN <-- correct.

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