[R] Axis label spanning multiple plots

[Andre Nathan]

Hello

On Wed, 2009-05-27 at 13:38 -0600, Greg Snow wrote:
> Create an outer margin (see ?par), then use mtext to put the title in the outer margin.

Sorry for taking that long to reply...

I created an outer margin with

  par(oma = c (0, 2, 0, 0))

and then did

  par(mfrow = c(2, 1))
  plot(...)
  plot(...)
  mtext("title 1", side = 2, outer = T)

With that, the text "title 1" appears to the left of the second plot,
and not to the left of both plots, centered between them, which is what
I was trying to do. Is there a way to accomplish that (without manual
text positioning, that is)?

Thanks,
Andre