Dear Sören,
How about this?


do.call(cbind,tapply(v, k, summary))


HTH,

Jorge


On Fri, Mar 6, 2009 at 10:48 AM, <soeren.vogel@eawag.ch> wrote:

> ### example:start
> v <- sample(rnorm(200), 100, replace=T)
> k <- rep.int(c("locA", "locB", "locC", "locD"), 25)
> tapply(v, k, summary)
> ### example:end
>
> ... (hopefully) produces 4 summaries of v according to k group membership.
> How can I transform the output into a nice table with the croups as columns
> and the interesting statistics as lines?
>
> Thx, Sören
>
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