erpolator using both sample values and sample derivatives.
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 The interpolation polynomials match all sample points, including both values
 and provided derivatives. There is one polynomial for each component of
 the values vector. All polynomials have the same degree. The degree of the
 polynomials depends on the number of points and number of derivatives at each
 point. For example the interpolation polynomials for n sample points without
 any derivatives all have degree n-1. The interpolation polynomi