> 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

>

See

?`[`

for discussion.

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