R help - Apr 2001 - arrows or graphics below axes?

Hi, All.  I'm trying to make an arrow pointing to a particular value
on the x axis.

So, this is pretty much what I want:

20     210     220     230     240     250     260 ...
                ^
                |
                |

any ideas how to do this?  I tried a few things (like arrows), but
they didn't want to plot outside of the actual "plot" area...

thanks for any suggestions!

greg
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Hi

> Hi, All.  I'm trying to make an arrow pointing to a particular value
> on the x axis.
>
> So, this is pretty much what I want:
>
> 20     210     220     230     240     250     260 ...
>                 ^
>                 |
>                 |
>
> any ideas how to do this?  I tried a few things (like arrows), but
> they didn't want to plot outside of the actual "plot" area...
You can make use of the "xpd" parameter, which controls how much
clipping
occurs;  see help(par).  For example, try ...

    plot(1:10)
    arrows(3, par("usr")[3] - .1*(diff(par("usr")[3:4])), 3,
par("usr")[3],
xpd=T)

Paul


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