[R] deleting an arow added to a graphic

[Gabor Grothendieck]

This does not actually remove it but you could overwrite it with
an arrow the same color as the background and then plot a
new arrow:

x <- 1:10
plot(x ~ x)
arrows(1, 1, 2, 2)

# revise it
arrows(1, 1, 2, 2, col = "white")
arrows(2, 2, 3, 3)


On 9/6/06, Graham Smith <myotisone at gmail.com> wrote:
> I know this has got to be simple, but I have a added  an arrow to a graph
> with:
>
> arrows(5,8,8, predict(lmfit,data.frame(x=8)), length=0.1)
>
> but its in the wrong position, correcting it and running again adds an new
> arrow (which is what you would expect) so how do I
>
> a) edit the existing arrow, and
> b) delete it all together
>
> As so often seems to be the case, some of the simplist things seem also to
> be the most difficult to find the answer to.
>
> Many thanks,
>
> Graham
>
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