sorry i misread the question -- i thought you wanted the two plots  
were in one row. Here are a few options,

1- use ggplot2 or lattice, this is the default position for the labels  
in a plot with facets

> library(ggplot2)
> qplot(mpg, wt, data=mtcars, facets=vs ~ .)


2- use layout() or split.screen() or the gridBase package to split the  
window in three regions,

> layout(matrix(c(3,1,3,2), 2, 2, byrow = TRUE), width=c(1,5))
> layout.show(3)
> plot(1:10)
> plot(1:10)
> plot.new() # necessary to draw something here
> text(0.5,0.5,"y label",srt=90)


HTH,

baptiste

On 1 Jun 2009, at 22:30, Andre Nathan wrote:

> On Mon, 2009-06-01 at 22:24 +0200, baptiste auguie wrote:
>> you can use title() with the sub argument,
>>
>> title(sub="x label", outer=T) # you might want to play around with
>> line argument
>
> Can title() span two plots? I'm trying to use a single title for two
> plots, something like
>
>    +------------+
>  t |            |
>    |            |
>  i |            |
>    +------------+
>  t
>    +------------+
>  l |            |
>    |            |
>  e |            |
>    +------------+
>
>
> Thanks,
> Andre
>
> ______________________________________________
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> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

_____________________________

Baptiste Auguié

School of Physics
University of Exeter
Stocker Road,
Exeter, Devon,
EX4 4QL, UK

Phone: +44 1392 264187

http://newton.ex.ac.uk/research/emag
______________________________


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