[R] vertical lines in R plot

[Sarah Goslee]

Like this:

segments(x0=c(5.0,5.5,6), y0=c(0,0,0), x1=c(5.0,5.5,6), y1=c(0.12,0.60,0.20))

If you wanted them to extend the entire height of the plot,
abline(v=c(5.0,5.5,6))
is simpler.

Thanks for the reproducible example,
Sarah

On Mon, Mar 11, 2013 at 10:10 AM, Naser Jamil <jamilnaser79 at gmail.com> wrote:
> Dear All,
> May I seek your suggestion on a simple issue. I want to draw vertical lines
> at some positions in the following R plot. To be more specific, I wish to
> draw vertical lines at d=c(5.0,5.5,6) and they should go till
> p=c(0.12,0.60,0.20) .  I haven't  found any way out, though made several
> attempts. Please run the following commands first if you are interested in!
>
> #######################################################
>
> psi1<-function(alpha1,beta1,alpha2,beta2,d){
> exp(alpha1+beta1*d)/((1+exp(alpha1+beta1*d))*(1+exp(alpha2+beta2*d)))
>                                            }
> alpha1<--3.5
> beta1<-1
> alpha2<--6
> beta2<-0.72
>
> d<-seq(0.5,10,0.01)
> plot(d,psi1(alpha1,beta1,alpha2,beta2,d),type="l",pch=18, ylim=c(0,1),
> xlab="Dose", ylab="Probabilitty")
>
> ##########################################################
>
>
> Many thanks for the help!
>
> Regards,
> Jamil.
>

-- 
Sarah Goslee
http://www.functionaldiversity.org