ibr (version 1.3.1)

tpsSx: Evaluate the smoothing matrix at any point

Description

The function evaluates the matrix Q and S related to the explanatory variables $X$ at any points. This function is not intended to be used directly.

Usage

tpsSx(X,Xetoile,lambda,m=2)

Value

Returns a list containing two matrices denoted Sgu (for null space) and Qgu

Details

see the reference for detailed explanation of Q (the semi kernel) and S (the polynomial null space). Both matrices are computed using fields.

References

C. Gu (2002) Smoothing spline anova models. New York: Springer-Verlag.

See Also

ibr, fields.mkpoly, Rad.cov