[R] Smoothing Spline Basis Matrix

[pinkdd]

Anybody knows how to generate the basis matrix for smoothing spline? 

And how about the smoother matrix? I tried to use the following code, but
there exist replicated data in X, and the length of smooth.spline(X,
S[,i])$y  is smaller than X, and then there is error in the last step.

spl <- smooth.spline(X, Y)
S <- diag(X)
for (i in 1:N)
S[i,] <- smooth.spline(X, S[,i])$y #smoother matrix S


Someone help please! Thanks in advance.
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