[R] add a vertical line in a 2d histogram !

[Uwe Ligges]

Dong Hui Ma wrote:

> Dear all,
> I have a stupid question!
> Just want to know is there some function like "abline" can be used
> in 3 dimensional case?
> 
> Thank you in advance!"

May I ask which kind of a histogram in 3 dim. case you mean? Which 
function from which package in which version of R under what OS?

Uwe Ligges