Dear Amanda,
Try this:

# Data set
set.seed(123)
DF=data.frame(A=rnorm(10),B=rpois(10,10),C=sample(1:3,10,replace=T))
attach(DF)

# Plot
plot(A,B,pch=16,col=C)
legend('topleft',paste('Group',1:3,sep=" "),col=1:3,pch=16)

HTH,

Jorge



On Fri, Sep 12, 2008 at 6:29 PM, Amanda Young <amandag@mit.edu> wrote:

> Hi,
> I am a complete R rookie so this question is probably really simple
> but I haven't found an answer on the web that I can understand.
>
> My data frame has 3 columns, A, B and C. A and B have numbers (about
> 8000 rows), C is a factor which is either true or false. So I can
> plot A vs B with plot(dataframe$A, dataframe$B). However, I would
> like the points to be different colors depending on whether C is True
> or False. Even better, if C had more than 2 groups, like group 1,2,3
> can I make all 3 different colors, etc? It would be really helpful to
> give an example using my  scenario since I have a lot of trouble
> understanding other examples on the web because the data is not set
> up like my data.
>
> Thanks so much!!!
> Amanda
>
>
>
>
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