Displaying 1 result from an estimated 1 matches for "tp2288120p2288166".
2010 Jul 13
2
Checking for duplicate rows in data frame efficiently
I wrote something to check for duplicate rows in a data frame, but it is too inefficient. Is there a way to do this without the nested loops?
This code correctly indicates rows 1-7, 1-8, 2-9 and 7-8 are duplicates.
> m <- matrix(c(1,1,1,1,1, 2,2,2,2,2, 6,6,6,6,6, 3,3,3,3,3, 4,4,4,4,4, 5,5,5,5,5, 1,1,1,1,1, 1,1,1,1,1, 2,2,2,2,2, 7,7,7,7,7), ncol=5, byrow=TRUE)
> df <- data.frame(m)