[R] evaluating density objects

[ripley@stats.ox.ac.uk]

On Thu, 14 Nov 2002, Hinnerk Boriss wrote:

> Is there a way to evaluate "density" objects other than with plot, so
> that I can write data points to a file and plot them with gnuplot? Can
> anyone help?

?density tells you

Value:

     If `give.Rkern' is true, the number R(K), otherwise an object with
     class `"density"' whose underlying structure is a list containing
     the following components.

       x: the `n' coordinates of the points where the density is
          estimated.

       y: the estimated density values.

...

so you could for example do

dens <- density(...)
write.table(data.frame(x=dens$x, y=dens$y), "somefile")

I have no idea why anyone would want to plot in gnuplot rather than in R,
and hence don't know what formats gnuplot accepts.

-- 
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

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