Note that it does not work in this case:
> aggregate(CO2[4:5], CO2[1:2], mean)
PlantType conc uptake
1Qn1 Quebec 435 33.22857
2Qn2 Quebec 435 35.15714
3Qn3 Quebec 435 37.61429
4Qc1 Quebec 435 29.97143
5Qc3 Quebec 435 32.58571
6Qc2
bugfix already :P prior version fails when there is only one factor
in Ind. This version also might be faster as I avoid using aggregate
to create the dummy frame.
agg=function(z,Ind,FUN,...){
FUN.out=by(z,Ind,FUN,...)
num.cells=length(FUN.out)
num.values=length(FUN.out
Note that summaryBy in the doBy package can also do that.
library(doBy)
DF <- data.frame(z, A = Ind$A, B = Ind$B)
summaryBy(z ~ A + B, DF, FUN = summary)
summaryBy(z ~ A + B, DF, FUN = summary2)
On 7/13/07, Mike Lawrence <[EMAIL PROTECTED]> wrote:
> Hi all,
>
> This is my first post to the develo
Hi all,
This is my first post to the developers list. As I understand it,
aggregate() currently repeats a function across cells in a dataframe
but is only able to handle functions with single value returns.
Aggregate() also lacks the ability to retain the names given to the
returned value.
