DuchonS: Computes the semi-kernel of Duchon splines
Description
The function DuchonS computes the semi-kernel of Duchon splines. This function is not intended to be used directly.
Usage
DuchonS(x,m=2)
Arguments
x
A numeric matrix of explanatory variables, with n rows
and p columns.
m
Order of derivatives.
Value
The polynomial part evaluated.
References
Duchon, J. (1977) Splines minimizing rotation-invariant semi-norms in
Solobev spaces. in W. Shemp and K. Zeller (eds) Construction theory of
functions of several variables, 85-100, Springer, Berlin.