piecewisePolynomial-class: An S4 Class to Represent a Piecewise Polynomial
In Chen2357/rrinterp: Interpolation with minimum and maximum constraints

An S4 Class to Represent a Piecewise Polynomial

Use length(object) to get the number of piecewise ranges. Use predict(object, newdata) to evaluate at newdata. Alternatively, use as.function(x) to turn the piecewise polynomial into a function. Use differentiate(x) to take the derivative of each polynomial. Use plot(x) to lines{x} to plot the piecewise polynomial.

leftBound: A vector that stores the left bounds of the piecewise ranges.
rightBound: A vector that stores the right bounds of the piecewise ranges.
polynomial: A list that stores the polynomials at each piecewise ranges.