[R] evaluating density objects

[Daniel E. Ho]

Another way to do get multiple density estimates in the same plot:

dens1 <- density(VAR1)
dens0 <- density(VAR2)
plot(dens1$x,dens1$y,type="n",xlim=c(min(c(dens1$x,dens0$x)),max(c(dens1$x,d
ens0$x))),ylim=c(min(c(dens1$y,dens0$y)),max(c(dens1$y,dens0$y))))
lines(dens1)
lines(dens0)

where dens0, dens1 represent kernel densities of your VAR1 and VAR2,
respectively, and the third line simply sets the axes to the max and min
values of the densities.

Best,

Dan

----- Original Message -----
From: "Liaw, Andy" <andy_liaw at merck.com>
To: "'Hinnerk Boriss'" <boriss at izbi.uni-leipzig.de>; <ripley at stats.ox.ac.uk>
Cc: <R-help at stat.math.ethz.ch>
Sent: Friday, November 15, 2002 11:46 AM
Subject: RE: [R] evaluating density objects


> Are you talking about overlaying all the density estimates in the same
plot?
> If you have the density estimates in a matrix, just use something like:
>
> matplot(X, density.X, type="l")
>
> where X is the vector of points where density is estimated (e.g., the x
> component of a density object) and density.X is the matrix containing the
> density estimates.  Check out the options to matplot in its help page.
>
> HTH,
> Andy
>
>
> -----Original Message-----
> From: Hinnerk Boriss [mailto:boriss at izbi.uni-leipzig.de]
> Sent: Friday, November 15, 2002 10:57 AM
> To: ripley at stats.ox.ac.uk
> Cc: R-help at stat.math.ethz.ch
> Subject: RE: [R] evaluating density objects
>
>
> Thanks for all the suggestions!
>
> > 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.
>
> The point is that I want to plot many densities in one graph. I can do
> that with R using par(new=T), but I cannot print those graphs.
>
> Thus, I wonder if I could also apply (lapply) density(...) to a vector
> of x-values, to get a my different density functions evaluated all at
> the same x. Then, I should be able to write a file that looks like:
>
> X dens1(X) dens2(X) ...
>
> Can anyone help?
>
> Cheers,
> Hinnerk
>
>
>
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