R: Evaluate cyclic B spline basis

cSplineDes {mgcv}

R Documentation

Evaluate cyclic B spline basis

Uses splineDesign to set up the model matrix for a cyclic B-spline basis.

cSplineDes(x, knots, ord = 4)

`x`	covariate values for smooth.
`knots`	The knot locations: the range of these must include all the data.
`ord`	order of the basis. 4 is a cubic spline basis. Must be >1.

The routine is a wrapper that sets up a B-spline basis, where the basis functions wrap at the first and last knot locations.

A matrix with length(x) rows and length(knots)-1 columns.

 x <- 0:100/100;k<- 0:5/5
 X <- cSplineDes(x,k)
 plot(x,X[,1],type="l"); for (i in 2:5) lines(x,X[,i],col=i)

[Package mgcv version 1.5-5 Index]