[R] Scatterplot with data grouped by color

[hadley wickham]

On Fri, Sep 12, 2008 at 5:29 PM, Amanda Young <amandag at 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.

install.packages("ggplot2")
library(ggplot2)

qplot(A, B, data = dataframe, color = C)

That will also automatically draw a legend for you.  See
http://had.co.nz/ggplot2 for more info.

Hadley

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