R in a Nutshell, 2nd Edition

splines

This package provides functions for working with regression splines using the B-spline basis, bs, and the natural cubic spline basis, ns.

Functions

Function	Description
as.polySpline	Creates the piecewise polynomial representation of a spline object.
asVector	This is a generic function. Methods for this function coerce objects of given classes to vectors.
backSpline	Creates a monotone inverse of a monotone natural spline.
bs	Generates the B-spline basis matrix for a polynomial spline.
interpSpline	Creates an interpolation spline, either from x and y vectors or from a formula/data.frame combination.
ns	Generates the B-spline basis matrix for a natural cubic spline.
periodicSpline	Creates a periodic interpolation spline, either from x and y vectors or from a formula/data.frame combination.
polySpline	Creates the piecewise polynomial representation of a spline object.
spline.des	Evaluates the design matrix for the B-splines defined by knots at the values in x.
splineDesign	Evaluates the design matrix for the B-splines defined by knots at the values in x.
splineKnots	Returns the knot vector corresponding to a spline object.
splineOrder	Returns the order of a spline object.
xyVector	Creates an object to represent a set of x-y pairs.