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0.84731
2007 Jul 09
1
why function 'sum' within 'aggregate' need an 'index'?
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)
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