[R] How to generate natural cubic spline in R?

[spencerg]

Hello: 


      If B-splines will suffice, there are many capabilities in R for 
that.  My favorite is the 'fda' package, but 'splines' and other 
packages are also good. 


      The "splinefun" function in the "base" package returns a function 
to compute spline interpolations optionally using a natural spline.  
However, that is an interpolation spline and therefore does no smoothing. 

      To find other options for natural splines, I suggest you try the 
CRAN packages splines, mboost, pspline, Design, and mgcv.  I found them 
using the "RSiteSearch" packages available from R-Forge via 
'install.packages("RSiteSearch", repos="http://r-forge.r-project.org")', 
which also identified the "siggenes" package (which is not on CRAN).  I 
don't know if any of these actually use natural splines, but this gives 
you a reasonably short list to consider. 

      Hope this helps. 
      Spencer Graves
p.s.  The following are the commands I used with the "RSiteSearch" 
package:    

library(RSiteSearch)
natSpl <- RSiteSearch.function('natural spline')
str(natSpl)
summary(natSpl)

natSpl[1:23, c(1, 4, 5, 7)]
     

minben wrote:
> Suppose I have two var x and y,now I want to fits a natural cubic
> spline in x to y,at the same time create new var containing the
> smoothed values of y. How can I get it?
>
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