Hello, another problem. > x<-rep(1,10) > y<-rep(c(1,2),c(5,5)) > z<-seq(1:10) > ab<-data.frame(x,y,z) # now I want to do some work by the value of 'y' > by(ab,y,mean) y: 1 x y z 1 1 3 ------------------------------------------------------------ y: 2 x y z 1 2 8 # I do not want all the means, only the mean of 'z' > by(ab,y,function(x) mean(z)) y: 1 [1] 5.5 ------------------------------------------------------------ y: 2 [1] 5.5 > by(ab,y,function(x) mean(z,data=x)) y: 1 [1] 5.5 ------------------------------------------------------------ y: 2 [1] 5.5 > # so, how can I get the function(x) to be applied to each level of the index variable y. Actually I use my own function but the same happens, it is applied to all the data and there is no partition of the data acording to index Do not tell me that this version of R is completely buggy, I was waiting for the 1.7 to be out before upgrading
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