[R] x y plot with z coordinate scaling to a color value

Paul Hiemstra p.hiemstra at geo.uu.nl
Wed May 19 12:49:22 CEST 2010

Hi Jannis,

You can have a look at image(), or alternatively look at spplot. The 
latter assumes that you have your data structured according to the 
spatial R classes that the sp-package provides:

# transform to sp-object
gridded(meuse.grid) = ~x+y

spplot(meuse.grid, "dist")


On 05/19/2010 12:24 PM, Jannis wrote:
> Dears,
> before I start programming my own function I would like to ask you whether there is any function already available that lets me plot a x/y plot with the colors of the points determined by scaling a third variable z into a defined colorramp?
> Until now I am using a wild combination of functions to create a colorvector by hand, then calling
> plot(x,y,col=colors)
> and then using color.legend() from plotrix to add a colorbar. Is there anything where I can just call (for example)
> plot(x,y,z)
> and get a plot and a colorbar next to it?
> If not I have to program that myself because my current way involves a lot of steps and readjusting plotting regions.
> Thanks for your help!
> Jannis
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Drs. Paul Hiemstra
Department of Physical Geography
Faculty of Geosciences
University of Utrecht
Heidelberglaan 2
P.O. Box 80.115
3508 TC Utrecht
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