[R] Selecting variables from a data.frame

[Laurent Gautier]

On Tue, Dec 31, 2002 at 02:33:37AM +0100, Till Baumgaertel wrote:
> 
> My question: which is the most elegant way to select the desired variables?
> 
> 
> Or in general: I'd like to select 2^m variables starting with the n-th variable
> of the original set with a distinct distance d. If m==3, n==5 and d==3 this
> should get me the following variables:
> 5, 8, 11, 14, 17, 20, 23, 26

seq(n, n + d * (2^m - 1), by=d) 

seems to generate the index vector you want



Hopin' it helps,


Laurent