[R] extracting data from a dataframe

[Thomas Lumley]

On Fri, 2 Aug 2002, Tim Wilson wrote:

> Hi everyone,
>
> Here's a question about extracting data from a dataframe:
>
> Let's say I've got a dataframe with two vectors, TEST and GENDER. GENDER
> contains a 1 for males and 2 for females. I want to separate the results
> of TEST by GENDER so I can compare their means.
>
> What's the most efficient way to do this with R?
>

No guarantees of efficiency, but the easiest is
  split(df$TEST,df$GENDER)

	-thomas


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