[R] Finding indices with a certain property

[Jonathan Rougier]

On Tue, 7 Dec 1999, [ISO-8859-1] Göran Broström wrote:

> 
> I want the indices  i  for which  x[i] < 0 (say):
> 
> > x <- c(1, -1, 3, 3, -2)
> > where.negative(x)
> [1] 2 5

Try "which(x<0)".

Jonathan Rougier                       Science Laboratories
Department of Mathematical Sciences    South Road
University of Durham                   Durham DH1 3LE

"[B]egin upon the precept ... that the things we see are to be 
 weighed in the scale with what we know"  (Meredith, 1879, The Egoist)

-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._