Re: [R] Fitting spline using Pspline

From: guy33 <david.reshef_at_magd.ox.ac.uk>
Date: Sun, 29 May 2011 15:28:18 -0700 (PDT)

Ravi,

Thanks so much! You're right, smooth.spline does work on larger n.

Although, for some reason it's results are different (slightly less good?, but I'm not sure). For example, on the simple doppler function below, sm.spline seems to be closer to the true function than smooth.spline:

x=array(0,1000)
y=array(0,1000)
for (i in 1:1000){

	x[i] = i/1000
	y[i] = (x[i]*(1-x[i]))^.5 * sin(2*pi*(1.05/(x[i]+.05)))
}
plot(x,y)

fit = sm.spline(x, y, norder=2, cv=FALSE) lines(fit$x,fit$y)

fit2 = smooth.spline(x, y, cv=FALSE)
lines(fit2$x,fit2$y)

What do you make of that?
-guy33

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Received on Sun 29 May 2011 - 22:30:17 GMT

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