This has been dogging me for a while. I've started making a lot of tables
via xtable so the way I want to sort things is not always in alphabetical or
numerical order.
As an example, consider I have a dataframe as follows
set.seed(100)
a <- data.frame(V1=sample(letters[1:4],100, replace=T),V2=1:100)
I know I can sort the columns first by V1 first and then by V2 by:
sorted.a <- a[do.call(order,a[c('V1','V2')]),]
What I want to do is exactly that but I do not want V1 sorted
alphabetically. Rather, I would like it sorted as 'a','c','d','b'.
I know I could do it with a subset, rbind function but I thought there may
be a more elegant way?
Thanks for the help.
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