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2008 Apr 14
3
Is this an artifact of using "which"?
Dear all,
I used "which" to obtain a subset of values from my data.frame.
however, I find that there is a "trace" of the values I have removed.
Any suggestions would be greatly appreciate.
Below is my data:
d <- data.frame( val = 1:10,
group = sample(LETTERS[1:5], 10, repl=TRUE) )
>d
val group
1 1 B
2 2 E
3 3 B
4 4