smooth curves
On 6 Dec 2002, Michael A. Miller wrote:
"guerreau" == guerreau <alain.guerreau at fnac.net> writes:
> I would like to draw smooth curves instead of polygons. I
> could not find any spline function to do that : given an x
> and a y vectors, they all take the x in increasing order.
> Is there a function to draw a smooth curve through a set of
> points in any order ?
The locfit package local regression, likelihood and density estimation) can be used to that: library(locfit) data(ethanol) fit <- locfit(NOx~E,data=ethanol) plot(NOx~E,data=ethanol) lines(fit)
1) That package is in CRAN/Devel because it does not work (fully) with current R. 2) Your example is of a *smoothed* fit, not of a smooth interpolating curve.
Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272860 (secr) Oxford OX1 3TG, UK Fax: +44 1865 272595