Hi, people.
I am using R-2.5.0 now, when tried the function aggregate with sum, it
showed an error as following:
> a <- gl(3,10)
> b <- rnorm(30)
> aggregate(b,list(a),sum)
# here is the error message, it complained that an error in FUN(X[[1L]],
missing "INDEX", and no defaults value.
but the tapply function will be okay.
> tapply(b,list(a),sum)
1 2 3
2.113349 -5.972195 4.854731
furthermore, when I was using the R-2.5.0 pre-release version before.
it could work well.
> a <- gl(3,10)
> b <- rnorm(30)
> aggregate(b,list(a),sum) # it works well
Group.1 x
1 1 -1.0330482
2 2 0.1235796
3 3 -1.0086930
> tapply(b,list(a),sum) # so does tapply
1 2 3
-1.0330482 0.1235796 -1.0086930
So, who can tell what should I do to overcome this?
thanks a lot.
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