parr {bspline}

Polynomial formulation of B-spline

Description

Polynomial formulation of B-spline

Usage

parr(xk, n = 3L)

Arguments

xk

Numeric vector, knots

n

Integer scalar, polynomial order (3 by default)

Value

Numeric 3D array, the first index runs through n+1 polynomial coefficients; the second – through n+1 supporting intervals; and the last one through nk-n-1 B-splines (here nk=length(xk)). Knot interval of length 0 will have corresponding coefficients set to 0.