>From what I read this should work. So please help my misunderstanding:
> x <- data.frame(Name=c("A","A","C"), Category=c("a","a","b"),
> Quantity=c(1,2,3))
> x
Name Category Quantity
1 A a 1
2 A a 2
3 C b 3
> aggregate(x, by=as.list(setdiff(names(x),"Quantity")), sum)
Error in FUN(X[[1L]], ...) : arguments must have same length
The way I understand it is that 'aggegate' should group the rows that are the
same (in the above 1,2 are the same and 3 stands alone) and the FUN should be
applied to the ramaining column. I was expecting a data.frame like:
Name Category Quantity
1 A a 3
2 C b 3
But that is not what I got. Would someone be so kind as pointing out what I am
doing wrong?
Thank you.
Kevin
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