Remove specific rows in a matrix/data.frame
On Oct 13, 2011, at 12:42 PM, syrvn wrote:
Hi, imagine the following matrix/data.frame Letter Number a 1 a 1 b 1 b 0 c 0 c 1 d 0 d 0 If the numbers for two identical letters are also identical then I want to remove either the first or the second row of that letter. If for a letter the numbers are 1 and 0 I want to remove the row with the 0.
?duplicated
That means if the code works I would and up with the following matrix/data.frame Letter Number a 1 b 1 c 1 d 1
But with no 1's associated with 'd' this does not make sense.
Many thanks, Syrvn
David Winsemius, MD West Hartford, CT