[R] Properly labeling abline with text?

[David Winsemius]

?rect

--  
David Winsemius
On Mar 23, 2009, at 11:01 PM, Jason Rupert 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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David Winsemius, MD
Heritage Laboratories
West Hartford, CT