[R] Vanishing tick marks using bwplot (lattice)

[Patrick Connolly]

platform i686-pc-linux-gnu
arch     i686             
os       linux-gnu        
system   i686, linux-gnu  
status                    
major    1                
minor    5.1              
year     2002             
month    06               
day      17               
language R 

I've been using bwplot to plot a dataframe that has a structure like
this:

str(plot.df)
`data.frame':	5952 obs. of  4 variables:
 $ Year    : Factor w/ 16 levels "1986","1987",..: 1 1 1 1 1 1 1 1 1 1 ...
 $ Day     : num  1 2 3 4 5 6 7 8 9 10 ...
 $ Month   : Factor w/ 12 levels "Jan","Feb","Mar",..: 1 1 1 1 1 1 1 1 1 1 ...
 $ Rainfall: Named num  NA 64 388 433 121 NA NA 90 1 NA ...
  ..- attr(*, "names")= chr  "Jan1" "Jan2" "Jan3" "Jan4" ...

Everything works if I plot it this way:
bwplot(Year ~ Rainfall | Month, data = plot.df)

but if I try:
bwplot(Month ~ Rainfall | Year, data = plot.df)

the tick marks vanish from the top.  Not only that, about 55mm at the
top of the plotting region is not used, so that even if the ticks were
drawn, there'd still be 50mm unused.

The only differences I can see are the number of panels plotted (12 in
the one that work, and 16 in the one that doesn't) and the factor on
the y-axis that doesn't work is not in alphabetical order.  However, I
can't imagine how those differences could produce the effect.

Ideas?

-- 
Patrick Connolly
HortResearch
Mt Albert
Auckland
New Zealand 
Ph: +64-9 815 4200 x 7188
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the beaches of the world ... Perhaps you`ve seen it.  ---Steven Wright 
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