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  1. Commons Math
  2. MATH-821

SparseRealVectorTest.testMap and testMapToSelf fail because zero entries lose their sign

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Details

    • Bug
    • Status: Closed
    • Major
    • Resolution: Fixed
    • 3.0
    • 3.3

    Description

      Mapping Inverse to an OpenMapRealVector can lead to wrong answers, because 1.0 / 0.0 should return +/-Infinity depending on the sign of the zero entry. Since the sign is lost in OpenMapRealVector, the answer must be wrong if the entry is truly -0.0.

      This is a difficult bug, because it potentially affects any function passed to OpenMapRealVector.map() or mapToSelf(). I would recommend we relax the requirements in the unit tests of this class, and make people aware of the issue in the class documentation.

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            Unassigned Unassigned
            celestin Sebastien Brisard
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