[R] Adding text to a multiplot (via mfrow)

[Peter Ehlers]

On 2010-11-30 09:40, smj_115 wrote:
>
> Hi
>
> I have created a set of 4 barplots using mfrow=c(2,2) and need to
> add a heading that spans the margin of the bottom 2 graphs.
>
> I have used locator(1) to find the coordinates but I dont seem to be able to
> add text anywhere on this multiplot.
>
> I would be really grateful if anyone could tell me if there is a simple
> method of achieving this.
>

You probably want to look at ?mtext and especially its
arguments 'outer', 'side', 'adj' and 'line'.
But make sure that there's enough space in the margin with
par(oma = c(....)).

Peter Ehlers

> Many thanks
>
> Sam Jones