Dear list,
I wish to modify programmatically only a few factor levels, according
to a named list. I came up with this function,
modify.levels <- function(f, modify=list()){
## levels that will not be changed
names.old.levels <- setdiff(levels(f), unlist(modify))
## as a named list
old.levels <- as.pairlist(names.old.levels)
names(old.levels) <- names.old.levels
## union of unchanged levels and modified ones
levels(f) <- modifyList(old.levels, modify)
f
}
f <- factor(LETTERS[1:4])
f2 <- modify.levels(f, list(aa = "A", cc="C"))
It seems to work, but the original order of the levels is changed.
Have I missed a better way of doing this manipulation?
Best regards,
baptiste
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