[R] abline

[Gabor Grothendieck]

abline does not have a y parameter so it is letting
you know that you have specified an invalid parameter.
See

?abline

Issuing the command

args(abline)

is another way to find out the arguments to a command.

At any rate, based on your description I think you want
segments. See

?segments

---
Date:   Mon, 8 Mar 2004 09:54:08 -0800 (PST) 
From:   Grace Conlon <gracestat at yahoo.com>
To:   <R-help at stat.math.ethz.ch> 
Subject:   [R] abline 

 
if I want to specify y-coordinates for the heights of horizontal lines to go across a plot.

x <- c(1,2,3,6,4,8,4,7)
y <- c(3,2,7,4,5,4,5,6)
h <- c(3,5,7)
plot(x,y)
abline(y=h)

However I got error message:
Warning message: 
parameter "y" couldn't be set in high-level plot() function 
(I tried abline(h=y) , it;s not what I want also)

Do u know why?