Hi,
I have the following data-frame:
x <- data.frame(first = c('a','c','k','b'), second = c('b','k','a','j'), third
= c('f','a','h','b'))
first second third
1 a b f
2 c k a
3 k a h
4 b j b
Now I would like to see wether there are entries that exists in all three
columns.
In the example data-frame this would be true for 'a' and 'b'
(so the row-number of the element is not important).
can someone help me on this?
thanks!
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