Dear R-users,
I'd be very greatful if you could help me with the following as after a
few tests I haven't still been able to get the right outcome.
I've got this data:
dd_1 <- data.frame(ID = c("1","2", "3", "4", "5"),
Class_a = c("a",NA, "a", NA, NA),
Class_b = c(NA, "b", "b", "b", "b"))
And I'd like to produce a new column 'CLASS':
dd_2 <- data.frame(ID = c("1","2", "3", "4", "5"),
Class_a = c("a",NA, "a", NA, NA),
Class_b = c(NA, "b", "b", "b", "b"),
CLASS = c("a", "b", "a-b", "b", "b"))
Thanks a lot!
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