Code adapted from Numerical Recipes in C. Main changes are to make all vectors zero-based; pass in a vector of points rather than two arrays of x and y. Calculates a vector of second derivatives, for each pillar. Normally this is invoked only once for each interpolator.
(
xy: &[(T, f64)], yp0: f64, ypn: f64, y2: &mut[f64])
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