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  1. Commons Math
  2. MATH-57

[math] NaN handling in StatsUtil.min, StatsUtil.max methods

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 1.0
    • Fix Version/s: None
    • Labels:
      None
    • Environment:

      Operating System: Windows 2000
      Platform: PC

    • Bugzilla Id:
      37019

      Description

      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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            • Assignee:
              Unassigned
              Reporter:
              mark.osborn@research.ge.com Mark Osborn
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              Dates

              • Created:
                Updated:
                Resolved: