[R] Calculating mean together with split
Rainer M Krug
rkrug at sun.ac.za
Wed Sep 20 15:52:25 CEST 2006
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
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
Department of Conservation Ecology and Entomology
University of Stellenbosch
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
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