Re: [R] operation on a data.frame

From: Federico Abascal <>
Date: Mon, 26 May 2008 12:37:48 +0200

That is just what I wanted :-)
For me it is incredible... all in one single line. Thank you!


Philipp Pagel wrote:
>> I would like to obtain a data.frame or matrix in which rows with an
>> equal string on column "C1" are averaged. In the previous example, rows
>> "One", "Four" and "Five" should be averaged because the three have "A"
>> con C1. The resulting row should be: "A" 10/3 28/3 46/3
> I think this is waht you are looking for:
> aggregate(df[-1], by=list(C1=df$C1), mean)
> cu
> Philipp

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