R help - Sep 2011 - problem with math expressions in grid graphics when using line breaks (\n)

I want to plot a multiline annotation including a mathematical expression using
grid graphics (grid.text).
This works fine for a single line, but the math expression is misplaced when I
insert a line break ("\n" escape sequence):

grid.text(expression(paste("Some words here\n more ", sigma)))

Does someone have an idea how to fix that?
TIA!

Mark
???????????????????????????????????????
Mark Heckmann
Blog: www.markheckmann.de
R-Blog: http://ryouready.wordpress.com

>From the plotmath help page:
"Control characters (e.g. \n) are not interpreted in character strings
in plotmath, unlike normal plotting."

In other words, "you can't do that".

However, since you're using grid graphics, this thread from the
ggplot2 group might be helpful:
http://groups.google.com/group/ggplot2/browse_thread/thread/7ff9a9675e197ff3/cdc31fb3a5d7688d?lnk=gst&q=Baptiste%2Bmultiple%2Bline%2Blabel#cdc31fb3a5d7688d

The code by Baptiste Auguie is what to look for.

HTH,
Dennis

On Thu, Sep 8, 2011 at 10:20 AM, Mark Heckmann <mark.heckmann at gmx.de>
wrote:
> I want to plot a multiline annotation including a mathematical expression
using grid graphics (grid.text).
> This works fine for a single line, but the math expression is misplaced
when I insert a line break ("\n" escape sequence):
>
> grid.text(expression(paste("Some words here\n more ", sigma)))
>
> Does someone have an idea how to fix that?
> TIA!
>
> Mark
> ???????????????????????????????????????
> Mark Heckmann
> Blog: www.markheckmann.de
> R-Blog: http://ryouready.wordpress.com
>
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