[R] Relevel dynamically

[mails]

Dear list,


I am running R code which produces a data.frame with variable rows. For
plotting purposes I need to relevel 
the column called "names" but since the dimension of the data.frame can vary
I do not know how to dynamically
revel the data.frame.

Here is an example data.frame called df to illustrate what I try to achieve:

> df <- data.frame(cbind(c("a","b","c","d","e"), c(5,6,4,8,9)))
> colnames(df) <- c("name", "value")
> df
  name value
1    a     5
2    b     6
3    c     4
4    d     8
5    e     9

Now the releveling:
df$name <- factor(df$name, levels=c("b","d","c","e","a"))

That was easy. But the plotting goes wrong when the data.frame has less
rows:

> df
  name value
1    a     5
4    d     8
5    e     9

Now my script runs the same line again:
df$name <- factor(df$name, levels=c("b","d","c","e","a"))

R does not throw any errors, however, lattice does not plot the results
correctly. So I dynamically create
a line which does the following: df$name <- factor(df$name,
levels=c("d","e","a"))


Thanks for any advice in advance!

Cheers




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