positiveMachineEpsilon top-level property
Actual double precision machine epsilon, the smallest number that can be added to 1, yielding a results different than 1.
This is also known as unit roundoff error. According to the definition of Prof. Higham. On a standard machine this is equivalent to positiveDoublePrecision.
final double positiveMachineEpsilon = _measurePositiveMachineEpsilon()