[R] modifying legend in scatterplot matrix R

[Dieter Menne]

Julien Beguin <julien.beguin.1 <at> ulaval.ca> writes:

> scatterplot.matrix(~ a + b + c,
>            groups=treatment,
...
>            legend.plot=T,
>            )
> legend("topright",c("fenced","unefenced"), fill=NULL,bty="o",cex=3)
> --------------------------------------------------------------------
> 
> In my dataset, the variable "treatment" contains two levels that are coded "N"
> and "Y" (for No and Yes) and appear in my "per default" legend that is located
> in the buttomright of my 3x3 scatterplot. I would like to replace N by a list
> of character: "unfenced" and Y by "fenced", as well as moving the legend in
> another place in my graphic... is someone know how to do that with a
> scatterplot?


In most cases it is easiest to assign new level to the factor;

a = as.factor(c("N","Y","Y","N"))
levels(a)=c("unfenced","fenced")
levels(ar)=c("unfenced","fenced") # if you want to keep orinale


legend has x,y coordinates.

Dieter