search for: stired

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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