[R] rotating axis labels in plot with multiple plots

[Karin Lagesen]

I have a plot like this, consisting of 18 different vioplots:

(monospaced font)

    ----- ----- ----- ----- ----- -----
lab |16 | |13 | |10 | | 7 | | 4 | | 1 |
    ----- ----- ----- ----- ----- -----
lab |17 | |14 | |11 | | 8 | | 5 | | 2 |
    ----- ----- ----- ----- ----- -----
lab |18 | |15 | |12 | | 9 | | 6 | | 3 |
    ----- ----- ----- ----- ----- -----
      a     b     c     d     e     f

This I create in such a way that in the graph itself plot 1 appears in
the top left corner, and plot 18 in the bottom right corner. I then
flip it around when I show it in my paper (it was simpler to do it
that way, this might change:)).

I am now trying to make labels a to f, which are a set of numbers
which are _local_ to each graph group. Now I would like these numbers
to be either vertical to the axis (so that they are in normal text
direction when the paper is rotated so that graphs 18-16 are on top),
or possibly 45 degrees to the plot group.

This is the way I create labels and such:

        plot.window(xlim = xlim, ylim = ylim)
        axis(2, at = at, labels=toptitle, tick=FALSE)
        if(!bottom) {
          if(!left){ # nothing > ok
            axis(1, at = at, labels = label, tick=FALSE)
          }
          else{ # not bottom, but left
            axis(1, at = at, labels = label, las=2)
          }
        }
        else{
          text(lognumbers, par("usr")[3] - 0.25, srt = 135, adj = 1,labels = loglabels, xpd = TRUE)
          if(!left){ # bottom, but not left
            # want to replace this one with the text
            # axis(4, at = lognumbers, labels=loglabels, las=2)
          }
          else{ # bottom and left > not ok
            axis(1, at = at, labels = label, las=2)
            # want to replace this one with the text
            # axis(4, at = lognumbers, labels=loglabels, las=2)
          }
        }
      }

In this sceme graphs 18-16 are defined as being left, whereas graphs
3, 6, 9, 12, 15, 18 are defined as bottom.

My question relates to my attemt to set nice-looking axis labels using
text. When I put them on as they are shown here, they show up on
(relative to image above) the left side of the "bottom" graphs. How do
I get them to show up on the side I would like them to?

Hope this was somewhat understandable...:)

Karin
-- 
Karin Lagesen, PhD student
karin.lagesen at medisin.uio.no
http://www.cmbn.no/rognes/