[R] functions available for use with aggregate?

[Spencer Graves]

	  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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