R help - Sep 2010 - Change plot order in lattice xyplot

Greetings,

I am writing with a question regarding plotting using the xyplot command in
lattice. I currently have the commands shown below, but I need to produce a plot
that orders the Month variable differently. I was told to use the
lattice.options command (shown below) to change the plot order, and this helped
by starting the plot at a point other than the bottom-left origin, but this did
not transpose the plot in the way I need. I need the plot to begin with June,
then July, August, September, October, beginning at the top left side of the
plot area. Does anyone now how to make this happen?

A section of my data and the commands I am currently using are shown below.
Thank you for any assistance!
Data:


Month
Log10_echo_integration_dens
Log10_trawl_dens
June
-2.55876
-2.74726
June
-2.24346
-3.7015
July
-3.14616
-2.83227
July
-2.69961
-3.7015
August
-2.96135
-3.7015
August
-2.29246
-2.29232
September
-2.2096
-2.20181
September
-1.80488
-1.81614
October
-2.28896
-1.84266
October
-2.4
-2.35319


#Commands
lattice.options(default.args = list(as.table = TRUE))
xyplot(Log10_trawl_dens~Log10_echo_integration_dens | Month, data =
(subset(T.A., Net_Type=="T")),ylim=c(-4,0),xlim=c(-4,0),xlab="Log
density from hydroacoustics (integration)",ylab="Log density from
Tucker trawl",main="Density estimates, Tucker Trawl", cex=1.5)

Best,
Paul S.


	[[alternative HTML version deleted]]

Prior to creating a plot I usually just order the factor levels to the order
I want them in. So for your example I would do:

#Create some data
library(lattice)
x <- runif(100, 0, 20) 
df <- data.frame(x) 
df$y <- (1:10) 
df$Month <- c("October", "September", "August",
"July","June")

#Plot the figure
plt <-xyplot(x~y | Month, data =df,
		 layout=c(5,1),
		 xlab="Log density from hydroacoustics (integration)",    
                 ylab="Log density from Tucker trawl",
                 main="Density estimates, Tucker Trawl", 
                 cex=1.5) 

#Factor levels aren't in the order you want them in. Reorder them how you
want.
df$Month <- factor(df$Month,
levels=c("June","July","August",
"September",
"October"), order=TRUE)

#Plot again.
plt

HTH,

Sam

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