bs		Generate a Basis for Polynomial Splines 
ns		Generate a Basis Matrix for Natural Cubic Splines 
predict.bs 	Evaluate a predefined spline basis at new values
predict.ns 	Evaluate a predefined spline basis at new values
splineDesign	Create the design matrix for a collection of B-splines
interpSpline	Determine the natural interpolation spline
periodicSpline	Determine a periodic interpolation spline
polySpline	Construct the piecewise polynomial representation of a spline
splineKnots	Extract the knot positions from a spline object
splineOrder	Extract the spline order from a spline object
