[R] horizontal and vertical line with arrow in a plot

From: Roslina Zakaria <zroslina_at_yahoo.com>
Date: Thu, 03 Jun 2010 20:34:01 -0700 (PDT)

Hi r-users,

I would like to add a plot of vertical line segment with arrow from (77,.6) to (77,0) and also a horizontal  line segment with arrow from (0,0.6) to (77,.6) .  So far this is what I have:

plot(sq, cdf, type="l", lwd=4,col="blue",xaxs="i",yaxs="i", xlab= "Rainfall (mm)", ylab= "Random no.", main="Random number  and rainfall totals (mm)") abline(v=77,h=0.6,col=2,lwd=2,lty=3)
text(120,0.63, "r = 0.6")
text(120,0.05, "x = 70")

I also tried to use the 'diagram' and 'shape' package but not really sure how to use them.

Thank you for all the help given.

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