Dear Ruser,
  I use abline() function to add the reference line successfully, but i
can't display the values corresponding to the reference line on the x/y
axis, anybody knows how to display it?
 *My simulated  programs:*
y<-rnorm(50)
plot(x,y)
abline(v=0.5)  *#my question is how to display x=0.5 in the x axis?*
Thanks in advance.
-- 
With Kind Regards,

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Zhi Jie,Zhang ,PHD
Tel:86-21-54237149   epistat@gmail.com
Dept. of Epidemiology,school of public health,Fudan University
Address:No. 138 Yi Xue Yuan Road,Shanghai,China
Postcode:200032
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