R help - May 2011 - One main caption for an mfrow=c(2,1) plot window

Hello,
I'm trying to plot a series of pages in a pdf with one main caption for 
each page.
Each page should then have two plots in one row, preferably with an own 
caption.
I can't plot the main caption in a window, and subsequently plot the two 
graphics (next to each other) below it.

Here is what I've tried. This one almost does the job, but when plotting 
the two graphics, R generates a new pdf page.
The 3 commented lines were another approach I tried but didn't work out. 
The split.screen() erases what was previously drawn on the device (which 
is the main caption in my case):

x <- 1:10
y <- 10:1
pdf("sandbox.pdf", width=6.5, height=3)
for(i in 1:3){
   plot.new()
   title("derp")
   op <- par(mfrow=c(1,2))
#  split.screen(c(1,2))
   plot(x)
#  screen(2)
   plot(y)
#  close.screen(c(1,2))
   par(op)
}
dev.off()

Any ideas?

Thanks in advance,
  Alex

On 29.05.2011 22:52, Alexander Engelhardt wrote:
> Hello,
> I'm trying to plot a series of pages in a pdf with one main caption for
> each page.
> Each page should then have two plots in one row, preferably with an own
> caption.
> I can't plot the main caption in a window, and subsequently plot the
two
> graphics (next to each other) below it.
>
> Here is what I've tried. This one almost does the job, but when
plotting
> the two graphics, R generates a new pdf page.
> The 3 commented lines were another approach I tried but didn't work
out.
> The split.screen() erases what was previously drawn on the device (which
> is the main caption in my case):
>
> x <- 1:10
> y <- 10:1
> pdf("sandbox.pdf", width=6.5, height=3)
forget the rest and use outer margins as in:

par(mfrow = c(1, 2), oma = c(0, 0, 2, 0))
for(i in 1:3){
  plot(x)
  plot(y)
  title(outer = "derp")
}

dev.off()


Uwe Ligges


> for(i in 1:3){
> plot.new()
> title("derp")
> op <- par(mfrow=c(1,2))
> # split.screen(c(1,2))
> plot(x)
> # screen(2)
> plot(y)
> # close.screen(c(1,2))
> par(op)
> }
> dev.off()
>
> Any ideas?
>
> Thanks in advance,
> Alex
>
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