A function to reverse the role of names and values in a list.
Given a list with names x and values in a set y this function
returns a list with names in y and values in x.
reverseSplit(inList)
inList |
A named list with values that are vectors. |
First the list is unrolled to provide a two long vectors, names are repeated,
once for each of their values. Then the names are split by the values.
This turns out to be useful for inverting mappings between one set of identifiers and an other.
A list with length equal to the number of distinct values in the input list and values from the names of the input list.
R. Gentleman
l1 = list(a=1:4, b=c(2,3), d=c(4,5)) reverseSplit(l1)
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