[R] pdf() black&white; panel titles in lattice

[ftorrei2@uiuc.edu]

Hello,

I have two questions: 

1. How can I get black and white graphics using the pdf()
device? I have tried pdf(Name.pdf, bg="white", fg"black"), but
I still get  full-color graphics.

2. When using lattice, how do I change the title for each
panel?  By default it uses the categories of the grouping
factor. I would like to modify the labels in the graphic
without changing the data. Also, how do I add a title above
the graphic referring to this factor (not the main title of
the graph)? The title for the xlab refers to the independent
factor within each panel. I would like to explain what each
panel represents with something similar to xlab, this title
being above the graphic if possible.

Thanking you in adavance,
Francisco 
Francisco Torreira
Spanish, Italian and Portuguese
Univ. of Illinois at Urbana-Champaign
707 South Mathews Aven.
4031 FLB
Urbana, IL, 61801