[R] How to change parameters of Trellis-like graphs

[baba@muj.biglobe.ne.jp]

Dear R-lists

I have just upgraded the version 1.5.1 from 1.4.1 in my laptop PC,
because, I have to prepare graphs by using the grid and lattice packages. 
I tried it with 1.4.1, but I could not it. 
After upgrade to 1.5.1, I have finished it. 

Next, I tried to modify some graphs with as follows: 
#
#  setting color for graph
#
library(grid)
library(lattice)
background <- trellis.par.get()
background$col <- "white"
show.settings()
background <- trellis.par.set("background",background)
show.settings()
names(trellis.par.get())
dot.symbol <- trellis.par.get()
dot.symbol$col <- "yellow"
dot.symbol <- trellis.par.set("dot.symbol",dot.symbol)
show.settings()
#
#
#
First, I could change the background color from Gray to White. 
But, when the last code 'show.settings()' runs, R 1.5.1 have crushed on my laptop. 
I have no idea such how to change the dot color of graphs.
Does anyone tell me how to change the graph parameters?

Thanks in advance,
Baba


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