Subsetting a data.frame given some criteria

Question

How do I return only the Heights which satisfy an Age criterion in R?

i.e

Age Height 
1   0.5
1   0.6
1   0.7
1   0.6
4   2.0
4   2.3
4   2.3
         


        

Answer 1

Also, since you used "subset" in your question title, you could use that command. See ?subset and you'll find that subset(dat, Age == 4, select = "Height") works too.