[R] Splines under tension

[William Dunlap]

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of sam.e
> Sent: Sunday, May 16, 2010 10:13 AM
> To: r-help at r-project.org
> Subject: Re: [R] Splines under tension
> 
> 
> Thank you for the helpful direction to the smoothing splines 
> function, it was
> very helpful and is exactly what i am trying to do. My data 
> however is 3-D,
> i.e. i have x and y values which are coordinates for 
> different field sites
> and z values which are really what I am interested in analysing with
> interpolation.

Look into the 'Tps' (thin plate splines) package.

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com  

> This has posed a problem with many of the 
> spline functions in
> R. Even if i input my coordinate data as a matrix as my 'x' 
> value and my
> site data as my 'y' values i get the following error:
> 
> Error in xy.coords(x, y) : 'x' and 'y' lengths differ
> 
> I have made sure that there are the same amount of values and 
> that they are
> all of the same type, i.e. numeric but with little luck and i 
> am a bit lost
> as to what to try next. Does anyone have any suggestions?
> 
> Thanks, 
> 
> Sam
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