Interpolation and Extrapolation
Given the values of a function at a set of points,
it is often necessary to estimate the function for some other arbitrary
point.
This section demonstrates interpolation and extrapolation
with polynomial and rational functions.
The cubic spline method defines an interpolating
function with continuous first and second order derivatives.
Extensions of these methods to
more than one dimension are introduced.
Reference:
Numerical Recipies, chapter 3.
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