Is there a built in function to invert a list? i.e. to go from
list(
a = c("1", "2", "3"),
b = c("1"),
d = c("2", "4")
)
to
list(
"1" = c("a", "b"),
"2" = c("a", "d"),
"3" = "a",
"4" = "2"
)
Hadley
--
http://had.co.nz/
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