[R] Split a vector(list) into 3 list

Leeds, Mark (IED) Mark.Leeds at morganstanley.com
Fri May 18 02:48:14 CEST 2007

index is definitely defined in my version ( 2.4.0) because when I do
?index, I get info. Maybe you
Are using an older or younger version of R ? I'm really not sure why you
are experiencing that problem.

-----Original Message-----
From: Patrick Wang [mailto:pwang at berkeley.edu] 
Sent: Thursday, May 17, 2007 8:44 PM
To: Leeds, Mark (IED)
Cc: Patrick Wang; r-help at stat.math.ethz.ch
Subject: RE: [R] Split a vector(list) into 3 list


no index function was defined in R.

I try to use the split(order(temp), temp), the number of groups are
correct, however the result doesnot seem to be correct. I try to match
before the ordered index and the original index.


> If  temp is your vector then split(index(temp),temp) will give you 
> what you want.
> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Patrick Wang
> Sent: Thursday, May 17, 2007 8:15 PM
> To: r-help at stat.math.ethz.ch
> Subject: [R] Split a vector(list) into 3 list
> Hi,
> I have a vector contains values 1,2,3.
> Can I call a function split to split it into 3 vectors with 1 
> corresponds to value ==1, which contain all the indexes for value==1.
> 2 corresponds to value ==2 which contain all the indexes for value=2
> Thanks
> pat
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