How to delete Identical columns
On Mar 28, 2013, at 1:39 AM, Katherine Gobin wrote:
Dear R forum
Suppose I have a data.frame
df = data.frame(id = c(1:6), x = c(15, 21, 14, 21, 14, 38), y = c(36, 38, 55, 11, 5, 18), x.1 = c(15, 21, 14, 21, 14, 38), z = c("D", "B", "A", "F", "H", "P"))
df
id x y x.1 z 1 1 15 36 15 D 2 2 21 38 21 B 3 3 14 55 14 A 4 4 21 11 21 F 5 5 14 5 14 H 6 6 38 18 38 P Clearly columns x and x.1 are identical. In reality, I have a large data.frame and can't make out which columns are identical, but I am sure that column with name say x is repeated as x.1, x.2 etc. How to automatically identify and retain only one column (in this example column x) among the identical columns besides other non-identical columns (viz. id, y and z).
df[!duplicated(as.list(df))]
id x y z 1 1 15 36 D 2 2 21 38 B 3 3 14 55 A 4 4 21 11 F 5 5 14 5 H 6 6 38 18 P
Regards Katherine [[alternative HTML version deleted]]
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