1. There is also "aggregate.zoo" in the "zoo" package.
2. If your question is which functions can be used for the "FUN"
argument, you can write your own. For example:
> set.seed(1)
> tstDF <- data.frame(x=rep(1:4, e=2),
+ y=rnorm(8))
> aggregate(tstDF[2], tstDF[1],
+ function(z)max(z)/min(z))
x y
1 1 -0.2931474
2 2 -1.9090787
3 3 -0.4016093
4 4 1.5147327
>
spencer graves
Sundar Dorai-Raj wrote:
>
> t c wrote:
>
>>What are the functions available for use with “aggregate”? Where can a
>>reference to them be found?
>>
>>
>
>
> Since aggregate is a S3 generic, you can use
>
> methods(aggregate)
>
> to see what objects have an "aggregate" method. For me, I have the
> following:
>
> > methods(aggregate)
> [1] aggregate.data.frame aggregate.default aggregate.frm*
> [4] aggregate.ts
>
> Non-visible functions are asterisked
> >
>
> See ?methods for more details.
>
> HTH,
>
> --sundar
>
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--
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Senior Development Engineer
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