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

[John Kane]

# A very quick example of how to draw an arrow on a graph.
plot(1:10)
text(2,5, "Point 5 ", cex=.8)
arrows(3,5, 4.5, 5)


--- On Thu, 6/3/10, Roslina Zakaria <zroslina at yahoo.com> wrote:

> From: Roslina Zakaria <zroslina at yahoo.com>
> Subject: [R] horizontal and vertical line with arrow in a plot
> To: r-help at r-project.org
> Received: Thursday, June 3, 2010, 11:34 PM
> 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.
> 
> 
>       
>     [[alternative HTML version deleted]]
> 
> 
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