[R] Select fixed number of elements

Gerrit Eichner Gerrit.Eichner at math.uni-giessen.de
Wed Oct 30 09:41:02 CET 2013

Hello, Alaois,

if x is your vector maybe

n <- length( x)
positions <- trunc( quantile( seq( n), prob = 0:5/5))
x[ positions]

comes close to what you want.

  Hth  --  Gerrit

> Hi all, I have in my code some vectors that are not of equal size. I 
> would like to be able for each of these vectors select 6 elements that 
> are (almost) equally spaced. So the first one would be at (or close) to 
> the beginning the last one at (or close) to the end and the other 4 
> equally spaced between first and last element.
> How can I do something like that on a vector of not known size?
> I would like to thank you in advance for your help
> Regards
> Alex
> 	[[alternative HTML version deleted]]
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