The function DuchonS computes the semi-kernel of Duchon splines. This function is not intended to be used directly.
DuchonS(x,m=2)The polynomial part evaluated.
A numeric matrix of explanatory variables, with n rows and p columns.
Order of derivatives.
Pierre-Andre Cornillon, Nicolas Hengartner and Eric Matzner-Lober.
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.
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