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  1. Commons Math
  2. MATH-493

FastMath min and max fail with (Infinity,-Infinity) and (0,0, -0.0)

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Details

    • Bug
    • Status: Closed
    • Major
    • Resolution: Fixed
    • 2.2, 3.0
    • 2.2, 3.0
    • None

    Description

      FastMath min and max fail with (Infinity,-Infinity) and (0,0, -0.0):

      min(float 0.0, float -0.0) expected -0.0 actual 0.0
      min(float Infinity, float -Infinity) expected -Infinity actual NaN
      max(float 0.0, float -0.0) expected 0.0 actual -0.0
      max(float Infinity, float -Infinity) expected Infinity actual NaN

      Similarly for the double versions.

      The Infinity failures are because the code uses Float.isNaN(a + b) which gives NaN when +/1- Infinity are added together.

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              Updated:
              Resolved: