R help - Oct 2010 - How to control in order of groups in xyplot

Hi guys,

I used the following R code to generate one plot

library(lattice)
xyplot(Y~X1|as.factor(X2)*as.factor(X3), groups = as.factor(X4),
data=mydata)

Both X2 and X3 have three values. X4 has two values. I got 3x3 grids and in
each grid there are two curves about y~x1 for the two X4 values. I am quite
happy with the plot except that I need a different layout of the 3x3 layout.
For example, X2={"m=2", "m=5", and "m=10"} and it
plots with the order
"m=10", "m=2", and "m=5". Is there any way I can
control the order of the
groups in the whole plot? Thanks a lot,

--Jerry

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A working minimal example would have been better, see FAQ.

But I think you are looking for the following:

X2 <- factor(c("m=2", "m=5", "m=10"),
levels=c("m=2", "m=5", "m=10"))

Here levels are ordered in your way. There might be other solutions for 
this ordering problem.

Hope it helps,
Rainer


On 31.10.2010 06:55 (UTC+1), Jie Liu wrote:
> Hi guys,
>
> I used the following R code to generate one plot
>
> library(lattice)
> xyplot(Y~X1|as.factor(X2)*as.factor(X3), groups = as.factor(X4),
> data=mydata)
>
> Both X2 and X3 have three values. X4 has two values. I got 3x3 grids and in
> each grid there are two curves about y~x1 for the two X4 values. I am quite
> happy with the plot except that I need a different layout of the 3x3
layout.
> For example, X2={"m=2", "m=5", and "m=10"}
and it plots with the order
> "m=10", "m=2", and "m=5". Is there any way I
can control the order of the
> groups in the whole plot? Thanks a lot,
>
> --Jerry