(Assuming you aren't going into ggplot2)
You can have a look here, it might offer a nice solution:

http://rgm2.lab.nig.ac.jp/RGM2/R_man-2.9.0/library/shape/man/colorlegend.html


Also, you can use ?cut to change your coloring to specific chunks (although
having a full gradient is probably nicer)


----------------Contact
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On Thu, Nov 18, 2010 at 5:18 PM, Alaios <alaios@yahoo.com> wrote:

> Thanks a lot for your help
>
> I tried first this
> test<-(myvalues)-mean(myvalues)
>
> so to put the values close to the 0...30 scale...
> then I passed this as an argument
>
> plot(x,y,col=test)
>
> which plots the places where the robots are with a small color. I think
> this is ok for now. What I want next is also to plot some color bar so the
> reader can by inspecting first this color bar to say "Ah the read is for the
> range of 5-10 watts"
>
> Also I tried legend... which creates small boxes below the dots which is Do
> not what I want exactly. I would like below every plot to write some text
> but not inside any box that will cover part of the image.
>
> Best Regards
> Alex
>
> --- On *Thu, 11/18/10, Tal Galili <tal.galili@gmail.com>* wrote:
>
>
> From: Tal Galili <tal.galili@gmail.com>
> Subject: Re: [R] Help me with R plotting
> To: "Alaios" <alaios@yahoo.com>
> Cc: "Rhelp" <r-help@r-project.org>
> Date: Thursday, November 18, 2010, 2:13 PM
>
>
> ?plot
> Will give a good solution
>
> #Example:
> set.seed(5)
> xx <- data.frame(x = runif(50), y = runif(50), z = sample(c(1:3), 50, T))
> with(xx, plot(x, y, col = z, pch = 19))
>
> Now you can start going into how to play with the colors, and how to add
> ?legend to the image...
>
> Tal
>
>
>
> ----------------Contact
> Details:-------------------------------------------------------
> Contact me: Tal.Galili@gmail.com<http://mc/compose?to=Tal.Galili@gmail.com>|  972-52-7275845
> Read me: www.talgalili.com (Hebrew) | www.biostatistics.co.il (Hebrew) |
> www.r-statistics.com (English)
>
> ----------------------------------------------------------------------------------------------
>
>
>
>
> On Thu, Nov 18, 2010 at 4:08 PM, Alaios <alaios@yahoo.com<http://mc/compose?to=alaios@yahoo.com>
> > wrote:
>
> Hello everyone.
> I want some help with plots.
> I have some robots in an area. Every robot is placed on x,y coordinates and
> every robot has a power consumption of some watts. I would like to show
> where are the robots by showing in a map dots (where every dots is the x,y
> coordinate).
> Below that dot it would be nice to write the watt consumption but also use
> some colors to denote different classes of consumption. So 10-20watt should
> be denoted by blue 20-30 with red, 30-40 with pink and so on.
>
> Which is the appropriate plot function for that?
>
> Regards
> Alex
>
>
>
>
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>
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>
>

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