[R] Specifying relative position of text in a plot

[Alberto Monteiro]

Tom La Bone asked:
>
> What is the simplest way to specify the location of text in a 
> scatter plot
> (created using the plot function) in relative terms rather than 
> specific x-y coordinates? For example, rather than putting text at 
> (300,49) on a plot, how do I put it 1/10 of the way over from the y 
> axis and 1/2 of the way up from the x axis? Thanks.
> 
See the help of par:
?par

Namely:

plot(rnorm(100), rnorm(100))
pu <- par()$usr
x <- pu[1] * 0.5 + pu[2] * 0.5
y <- pu[3] * 0.1 + pu[4] * 0.9
text(x, y, "the quick brown fox jumps over a lazy dog")

Alberto Monteiro