oskar_hertwig created MATH-972:
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             Summary: LinearInterpolator Misconception
                 Key: MATH-972
                 URL: https://issues.apache.org/jira/browse/MATH-972
             Project: Commons Math
          Issue Type: Bug
    Affects Versions: 3.2
         Environment: All
            Reporter: oskar_hertwig
            Priority: Trivial


The method interpolate() of the class LinearInterpolator return a 
polynomialSplineFunction althought a piecewiseContinuousFunction have to be 
returned.

This cause a bug. Indeed when the interpolated serie is localy constant the 
linear interpolation should lead to constant value between this points. This is 
not possible when the returned object is a PolynomialSplineFunction


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