Piecewise Polynomial Spline Representation

Description

Create the piecewise polynomial representation of a spline object.

Usage

polySpline(object, ...)
as.polySpline(object, ...)

Arguments

Value

An object that inherits from class polySpline. This is the piecewise polynomial representation of a univariate spline function. It is defined by a set of distinct numeric values called knots. The spline function is a polynomial function between each successive pair of knots. At each interior knot the polynomial segments on each side are constrained to have the same value of the function and some of its derivatives.

Author(s)

Douglas Bates and Bill Venables

See Also

interpSpline, periodicSpline, splineKnots, splineOrder

Examples

require(graphics)
ispl <- polySpline(interpSpline( weight ~ height,  women, bSpline = TRUE))

print( ispl )   # print the piecewise polynomial representation

plot( ispl )    # plots over the range of the knots
points( women$height, women$weight )