[R] how to draw image of a data distribution? Thanks

[Clint Bowman]

with(p,plot(x,y,pch=20,col=1+as.integer(value)))

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On Fri, 20 Nov 2009, Senlin Liang wrote:

> I have a file with 3 cols as:
> x    y    value
> 1    1    0.5000
> 1    2    1.8333
> 1    3    4.3333
> 2    1    0.7500
> 2    2    0.7500
> 2    3    4
> 3    1    0.7500
> 3    2    1.4167
> 3    3    5.1667
>
> I read them in using
> p <- read.table("data.txt", header=TRUE)
>
> My questoin: how to draw a image to show the values at different positions
> (x, y)? I would like to see different colors for different values.
>
> Sorry if it is a naive question, but it is my first week of R and I have
> been trying for several hours trying to make it.
>
> Thank you,
>