[R] abline

[Spencer Graves]

?abline in R 1.8.1 includes the following: 

Usage:

     abline(a, b, untf = FALSE, ...)
     abline(h=, untf = FALSE, ...)
     abline(v=, untf = FALSE, ...)
     abline(coef=, untf = FALSE, ...)
     abline(reg=, untf = FALSE, ...)

      It looks to me like you want "abline(h=h)".  hope this helps.  
spencer graves

Grace Conlon wrote:

>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?
> 
>
>
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