[R] Scatterplot with data grouped by color

Jim Lemon jim at bitwrit.com.au
Sat Sep 13 11:39:10 CEST 2008

Amanda Young 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.
Hi Amanda,
Have a look at the example for the color.scale function in the plotrix 
package. This will display the points in as many different colors as you 


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