Hi David aggregate is what I was looking for, as I wanted to have it in the tabular format to plot it.
Thanks Rainer David Barron wrote: > Of course, aggregate will work too, depends on how you want the output > to be formatted. You could also look at summarize in the Hmisc > package. > > On 20/09/06, David Barron <[EMAIL PROTECTED]> wrote: >> Sorry, that should have been package gdata, not gtools...they're both >> in the same bundle, though. >> >> 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] >> > >> > ______________________________________________ >> > R-help@stat.math.ethz.ch 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 >> > > -- 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] ______________________________________________ R-help@stat.math.ethz.ch 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.