[R] Select fixed number of elements
ken.knoblauch at inserm.fr
Wed Oct 30 09:52:00 CET 2013
Alaios <alaios <at> yahoo.com> writes:
> 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
Would something like this be what you are
N <- 20
x <- runif(N)
rx <- range(x)
br <- seq(rx, rx, len = 6)
x[which.min(abs(x - bx))]
 0.02910779 0.22708582 0.39239718
0.52419265 0.68940262 0.86889817
Stem-cell and Brain Research Institute
Department of Integrative Neurosciences
18 avenue du Doyen Lépine
tel: +33 (0)4 72 91 34 77
fax: +33 (0)4 72 91 34 61
portable: +33 (0)6 84 10 64 10
More information about the R-help