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2007 Mar 16
2
Duplicated non contiguous element in a list
Hello,
Given a vector I would like to rapidly identify duplicated non contiguous elements.
Given for example
c(1, 1, 2, 3, 2, 4, 5, 6, 4)
I would like to get:
FALSE FALSE TRUE FALSE TRUE TRUE FALSE FALSE TRUE
In fact I need to check this on the columns of a matrix!
I can do that of couse with loops but is there any function already available?
Thanks