[R] Contour Plots

[Liaw, Andy]

I guess what you want is contours of the density over the x-y plane.  There
are a few choices that I know of:

kde2d in MASS (part of the `VR' bundle)
bkde2d in KernSmooth
sm.density in sm
locfit in locfit

Andy

> From: Bernard L. Dillard
> 
> Hello all.
> 
> I'm confused a bit about contour plots.  After reading the help at
> "?contour", it seems as though the contour plot is for 3D 
> plots (x,y, and
> z).  My data is in the form of grid coordinates (x,y), and I 
> want to see a
> contour plot of the data so that I can tell where most 
> observations lie. 
> My question is simple but still evasive.
> 
> Say my data is called places.  One column is X and another is Y.  Or,
> 
>                   places$X          places$Y
> 
> Coordinate 1          32               50
> Coordinate 2          15               33
> Coordinate 3          28               20
> etc
> 
> How do I get R to do the contour plot with no third "z" coordinate?
> 
> Thanks.
> 
> -- 
> Do all you can with what you have in the time you have in the 
> place you are!
> 
> -Nkosi Johnson, 12-year old African hero
> 
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