Have a look at the function aggregate.table in the package gtools (part of the gregmisc bundle).
On 20/09/06, Rainer M Krug <[EMAIL PROTECTED]> wrote: > Hi > > 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 > > -- > 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: [EMAIL PROTECTED] > [EMAIL PROTECTED] > > ______________________________________________ > [email protected] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- ================================= David Barron Said Business School University of Oxford Park End Street Oxford OX1 1HP ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
