[R] mtext coordinates

[David Winsemius]

On Aug 18, 2010, at 6:40 AM, David Hajage wrote:

> Hello,
>
> I am using mtext to write some text below a graph:
>
> plot(1)
> mtext("foo", side = 1, line = 2, at = seq(0.6, 1.6, 0.2))
>
> I would like to draw something near the "foo" texts, for example a  
> segment.
> For this, I need to know the coordinates of the text ploted by mtext
> function.
>
> I spent a few hours to try different combination, using the option  
> xpd =
> TRUE and trying to convert between graphics coordinate system using
> grconvertX and grconvertY... But I can't make it.
>
> Is there a way to know the coordinates of the text produce by mtext,
> particularly vertical coordinates? For example, how can you draw some
> segments to underline each foo in my example?

 > plot(1)
 > mtext(expression(underline(foo)), side = 1, line = 2, at = seq(0.6,  
1.6, 0.2))

>
> Thank you very much for any help.
>
> david
>
> 	[[alternative HTML version deleted]]
>
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David Winsemius, MD
West Hartford, CT