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 <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> 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? ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html