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] > > > > ______________________________________________ > > [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 > -- ================================= 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.
