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Split the strings of a character vector, put together all the unique pieces and return a matrix of dummy vectors for each single value.
SplitToDummy(x, split = ",", ...)a data.frame containing x and all the found dummy vectors
character vector, each element of which is to be split. Other inputs, including a factor, will give an error.
character vector (or object which can be coerced to such) containing regular expression(s) (unless fixed = TRUE) to use for splitting. If empty matches occur, in particular if split has length 0, x is split into single characters. If split has length greater than 1, it is re-cycled along x.
the dots are passed on to strsplit
Andri Signorell <andri@signorell.net>
d.frm <- data.frame(id=1:5, txt=c("A,C,D", "A","B,C","D","D,E"))
SplitToDummy(d.frm$txt)
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