[R] multidimensional (smoothing) splines

Huntsinger, Reid reid_huntsinger at merck.com
Thu Sep 22 15:49:56 CEST 2005

Is the data you will use to fit the approximation located on a regular grid?
(If so you could use a 1D version repeatedly...) 

You might also have a look at package gss on CRAN. 

Reid Huntsinger

-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Tamas K Papp
Sent: Thursday, September 22, 2005 9:33 AM
To: R-help mailing list
Subject: [R] multidimensional (smoothing) splines


I am approximation a value function (in dynamic programming) V:
R^n->R.  In different versions of the problem, n is between 2 and 5.
I would like to use splines to use this, I checked the mailing list
and CRAN but couldn't find anything that would help me (Tps in fields
is too slow, cobs would be really nice but seems to be
one-dimensional).  Is there any package that would at least give me
the basis for multidimensional b-splines?  Or even one that would do
the fitting, perhaps even with constaints on derivatives at the edges
(which I can specify from theory)?

Thank you,


Bayesian statistics is difficult in the sense that thinking is difficult.
--Donald A. Berry, American Statistician 51:242 (1997)

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