[R] top 10 (n values) for each classes

Gabor Grothendieck ggrothendieck at gmail.com
Sun Feb 10 20:32:05 CET 2013

On Sun, Feb 10, 2013 at 5:31 AM, catalin roibu <catalinroibu at gmail.com> wrote:
> Dear R users,
> I have a problem. I don't know how to select the top 10 (n) values for each
> classes.

Assuming that by top n values in each group you mean the first n rows
in each group then:

n <- 5
dat1[ave(dat1$cls, dat1$cls, FUN = seq_along) <= n, ]

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