xyplot main title question

Pogoda, Wendy <wpogoda <at> coba.usf.edu> writes:

When I use the xyplot function (lattice library) the titles are too long 

....
How can I change the main title text size in the xyplot function? . 

This IS confusing. General rule: whenever you use a function from 
lattice/trellis, par(...) is the wrong way to go. Use trellis.par.get and 
trellis.par set instead.

library(lattice)

mt = trellis.par.get("par.main.text")
mt$cex = 0.7
# may also set other options, such as font.
trellis.par.set("par.main.text",mt)

xyplot(lat ~ long , data = quakes,
  main="This is a very long text This is a very long text ")

----
My way if lost in lattice:

trellis.par.get()

Copy the output you to a text file, and keep it on your disk. Whenever you want 
to set a graphics options, search that file for something that comes close, and 
use the above get/set. 
Don't forget to update the file on lattice updates, these settings change.
Use show.settings() helps sometimes, but it's not complete.

Dieter

When I use the xyplot function (lattice library) the titles are too long
(i.e. part of the title are cut off).  This fixes if I maximize the plot,
but I would like the user of the program to not have to manually maximize
the plotting window.  I have tried to shrink the main title by using the
"par(cex.main=.7)" before the xyplot function, but it seems any prior par
options are ignored by xyplot.  There is an option inside xyplot called
"par.settings", but I have been unable to figure out how to make it change
the main title text size.

So, there are 2 possible solutions to my problem: 1) if there a text command
to maximize the graphing window, what is it? or

None that I know of (though you can specify the width and height when
starting a device).

2) how can I change the main title text size in the xyplot function?

xyplot( ... ,
       par.settings = list(par.main.text = list(cex = 0.7)))

Deepayan