Hi all,

Could anybody recommend some easy-to-understand and example based
notes/tutorials on how to use cubic splines to do filtering on
multi-dimension data?

I am confused by the 1-dimensional case, and more confused by
multi-dimensional case.

I found all the books suddenly become very abstract when it comes to this
subject.

They don't provide examples in R or Splus at all.

Specifically, I don't know how to provide data "x" to the "ns" function in
R,

and I don't understand what should be the output matrix, and how to use the
output matrix to "filter" data?

Books mention about basis matrix, design matrix, model matrix, data matrix,
etc. I got lost.

I presume the output of the "ns" function in R is "basis matrix", but then
how do I use it?  How to form tensor-product?

I don't understand it at all.

Please help me!

Thank you very much!

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