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
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