[R] aggregate() classing var. def.

[Tord Snall]

Dear all,

I want to aggregate() my data based of the classes of a factors, just as in the 
help file, but how do I define the "Region varable" in the ?aggregate example?

Now, the column is just like any other in my data matrix. As I understand it 
from ?(state), state contains a matrix with the columns Pop, Income etc., but 
Region is somehow separated. I noted below that as.list() is not enough.

Could someone please give me a hint.

Thanks in advance!

Sincerely,
Tord Snäll

data(state)
> aggregate(state.x77, list(Region = state.region), mean)
Region Population   Income Illiteracy Life Exp    Murder  
Northeast   5495.111 4570.222   1.000000 71.26444  4.722222 
South   4208.125 4011.938   1.737500 69.70625 10.581250 
North Central   4803.000 4611.083   0.700000 71.76667  5.275000
West   2915.308 4702.615   1.023077 71.23462  7.215385 

> aggregate(mydata, by=cell, sum)
Error in aggregate.data.frame(mydata, by = cell, sum) : 
        `by' must be a list
> aggregate(mydata, by=as.list(cell), sum)
Error in FUN(X[[1]], ...) : arguments must have same length
> aggregate(as.list(mydata), by=as.list(cell), sum)
Error in FUN(X[[1]], ...) : arguments must have same length
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