Yep, my R-gut was right! Thanks Jean and Greg!
--j
On Thu, Jul 28, 2011 at 1:29 PM, Jean V Adams <jvad...@usgs.gov> wrote:
>
> Try this:
>
> split(dataframe, dataframe$x)
>
> Jean
>
>
> `·.,, ><(((º> `·.,, ><(((º> `·.,, ><(((º>
>
> Jean V. Adams
> Statistician
> U.S. Geological Survey
> Great Lakes Science Center
> 223 East Steinfest Road
> Antigo, WI 54409 USA
>
>
> From: Jonathan Greenberg <j...@illinois.edu> To: r-help <
> r-help@r-project.org> Date: 07/28/2011 03:22 PM Subject:
> [R] Data frame to list
> Sent by: r-help-boun...@r-project.org
> ------------------------------
>
>
>
> I'm hoping this is an easy problem that I'm missing something obvious.
> Given:
>
> x=c(1,1,1,2,2,3,3,3)
> y=c(1:length(x))
> dataframe=data.frame(x,y)
>
> I would like to convert this to a list for use with certain functions,
> where each entry of the list is a subsetted dataframe based on
> dataframe$x
>
> I can do this "brute force" by a for-next loop:
>
> unique_x=unique(dataframe$x)
> unique_x_N=length(unique_x)
> dataframe_to_list=vector(mode="list",length=unique_x_N)
> for(i in 1:unique_x_N)
> {
> dataframe_to_list[[i]]=subset(dataframe,x==unique_x[i])
>
> }
>
> My R-gut is telling me there's a much more efficient way of doing this
> -- is it right?
>
> --j
>
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> PLEASE do read the posting guide
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