[R] tapply output as a dataframe

[Dan Dube]

this is what i needed!  thank you. 

> -----Original Message-----
> From: Jorge Ivan Velez [mailto:jorgeivanvelez at gmail.com] 
> Sent: Monday, April 13, 2009 12:50 PM
> To: Dan Dube
> Cc: r-help at r-project.org
> Subject: Re: [R] tapply output as a dataframe
> 
> 
> Dear Dan,
> 
> Try this:
> 
> do.call(rbind,a)
> 
> 
> HTH,
> 
> Jorge
> 
> 
> 
> On Mon, Apr 13, 2009 at 12:41 PM, Dan Dube <ddube at advisen.com> wrote:
> 
> 
> 	i use tapply and by often, but i always end up banging 
> my head against
> 	the wall with the output.
> 	
> 	is there a simpler way to convert the output of the 
> following tapply to
> 	a dataframe or matrix than what i have here:
> 	
> 	# setup data for tapply
> 	dt = data.frame(bucket=rep(1:4,25),val=rnorm(100))
> 	fn = function(x) {
> 	 ret =
> 	
> c(unname(quantile(x,probs=seq(.25,.75,.25),na.rm=T)),mean(x,na.rm=T))
> 	}
> 	a = tapply(dt$val,dt$bucket,fn)
> 	
> 	# i seem to be doing way more work than i should here....
> 	n = names(a)
> 	mat = NULL
> 	for (i in 1:length(n)) {
> 	 mat = rbind(mat,unname(unlist(a[i])))
> 	}
> 	row.names(mat) = n
> 	
> 	thank you!
> 	
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> 	
> 
> 
>