[R] Calculating mean together with split
mothsailor at googlemail.com
Wed Sep 20 16:03:04 CEST 2006
Have a look at the function aggregate.table in the package gtools
(part of the gregmisc bundle).
On 20/09/06, Rainer M Krug <rkrug at sun.ac.za> wrote:
> I have a table called npl containing results of simulations.
> It contains about 19000 entries and the structure looks like this:
> NoPlants sim run year DensPlants
> 1 6 lng_cs99_renosterbos 1 4 0.00192
> it has 43 different entries for sim and year goes from 1 to 100, and run
> from 1 to 5.
> I would like to calculate the mean of DensPlants for each simulation and
> each year seperately, i.e. calculating the mean for all combinations of
> sim and year over run.
> I can use
> split(npl, npl$sim)
> to split npl into different groups each containing the entries for one
> parameterset - but where to go from there?
> Rainer M. Krug, Dipl. Phys. (Germany), MSc Conservation
> Biology (UCT)
> Department of Conservation Ecology and Entomology
> University of Stellenbosch
> Matieland 7602
> South Africa
> Tel: +27 - (0)72 808 2975 (w)
> Fax: +27 - (0)21 808 3304
> Cell: +27 - (0)83 9479 042
> email: RKrug at sun.ac.za
> Rainer at krugs.de
> R-help at stat.math.ethz.ch mailing list
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
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