1. RSiteSearch('{periodic spline}') produced 12 hits. I looked
at the first five and found that four of them seemed relevant to your
question.
2. The third hit in this list notes that the DierckxSpline
package has periodic splines, while 'fda' recommends finite Fourier
series for periodic functions; this hit documents an "as.fd" function
that approximates a 'dierckx' periodic object with a periodic 'fd' object.
Hope this helps.
Spencer
Duncan Murdoch wrote:
cmr.p...@gmail.com wrote:
Hello group!
Is there a package that allows to fit smooth *periodic* splines to
data? I'm interested in a function which combines the functionality of
smooth.spline and splines::periodicSpline.
I don't know one, but you could use the same technique that
periodicSpline uses: repeat a copy of the data to the left and right
of the main copy (similarly replicating the knots if you want
regression splines rather than smoothing splines), then fit to the
augmented dataset. I don't think it is guaranteed to be exactly
periodic, but it will be very close.
There is also the "periodic" option to splinefun and you might be able
to use it to construct a true periodic basis, but you'll have to work
out some tricky details to get that right.
Duncan Murdoch
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