Piecewise Polynomial Spline Representation
Create the piecewise polynomial representation of a spline object.
polySpline(object, ...) as.polySpline(object, ...)
- An object that inherits from class
- Optional additional arguments. At present no additional arguments are used.
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.
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 )
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