[R] Calculating mean together with split

[Rainer M Krug]

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 <mothsailor at googlemail.com> 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 <rkrug at sun.ac.za> 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:  RKrug at sun.ac.za
>> >         Rainer at krugs.de
>> >
>> > ______________________________________________
>> > R-help at 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:	RKrug at sun.ac.za
       	Rainer at krugs.de