Quick question about subsetting via character-class

Question

I think this is a super quick thing, but I figured I\'d ask since I can\'t for the life of me remember how to do it...

Suppose, I have a data.frame (call it, DF

Answer 1

subset(DF, select=foo[3])
              Blah
1   0.814939149951
2  -0.800644571486
3  -0.424080059851
4   1.012792429940
5   1.291888735720
6   0.642523425131
7   0.537486547429
8   0.315031122082
9  -0.296439716108
10  0.372453578695