Interpolation

cubicSpline	Cubic spline data interpolator.
cubicSplinePredict	Predict the corresponding y for x with the given model.
dividedDifference	Resample X based on the specified resampleRule, closed and origin.
kroghInterpolate	Interpolating polynomial for a set of points.
loess	Resample X based on the specified resampleRule, closed and origin.
neville	Resample X based on the specified resampleRule, closed and origin.
spline	Resample X based on the specified resampleRule, closed and origin.
splrep	splrep, short for Spline Representation, is used to find the B-spline representation of a one-dimensional curve.
splev	splev, short for Spline Evaluation, is used to evaluate B-spline curves or their derivatives.