[R] Properly labeling abline with text?

Gabor Grothendieck ggrothendieck at gmail.com
Tue Mar 24 04:40:30 CET 2009

Try this:

plot(x_vals, y_vals)
abline(h=min(y_vals), col="darkred")
boxed.labels(max(x_vals) - strwidth(bottom_label)/2, min(y_vals) +
strheight(bottom_label), bottom_label)

See ?boxed.labels for more.

On Mon, Mar 23, 2009 at 11:01 PM, Jason Rupert <jasonkrupert at yahoo.com> wrote:
> The result of the code shown below is posted at the following URL:
> http://n2.nabble.com/Trying-to-properly-label-abline-td2524629.html
> I would like to figure out a better way to label the horizontal abline.
> I tried multiplying the text y position by a scale, but this didn't always put the text in a useful position.   I guess I am curious if there is a preferred procedure for labeling the abline.  Is there a way to "fill" the text label and also put a box around the text label?  I guess I would also like to have the box around the text match the abline format.
> Thank you for any info or insights.
> x_vals<-1:1000
> y_vals<-rnorm(1000)
> plot(x_vals, y_vals)
> top_label<-paste("Top Label = ", format(max(y_vals), digits=2), sep="")
> abline(h=max(y_vals), col="darkred")
> text(max(x_vals), max(y_vals), top_label, pos=2)
> bottom_label<-paste("Bottom Label = ", format(min(y_vals),digits=2), sep="")
> abline(h=min(y_vals), col="darkred")
> text(max(x_vals), min(y_vals), bottom_label, pos=2)
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