> tmp <- matrix(1:24, 6, 4, dimnames=list(letters[1:6], LETTERS[1:4])) > tmp A B C D a 1 7 13 19 b 2 8 14 20 c 3 9 15 21 d 4 10 16 22 e 5 11 17 23 f 6 12 18 24 > tmp[c("a", "c", "d", "f"), ] A B C D a 1 7 13 19 c 3 9 15 21 d 4 10 16 22 f 6 12 18 24 >
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