Finding indices with a certain property

Quick answers to my question:

which(x < 0)

but also

indices<-function(x)seq(along=x)[x]
x <- c(1, -1, 3, 3, -2)
indices(x<0)

[1] 2 5

from some.

The last one is essentially the definition of  which, I think.
I had completely forgotten  which  (where?!?) 

Thanks to Thomas Lumley, Jonathan Rougier, Martin Maechler,
Peter Dalgaard, Brian Ripley!

G?ran

Original question:

I want the indices  i  for which  x[i] < 0 (say):

x <- c(1, -1, 3, 3, -2)
where.negative(x)

[1] 2 5

Surely  where.negative  is something simple, but how?

--------------------------------------------------------------
 G?ran Brostr?m
 Department of Statistics              tel: +46 90 786-5223
 Ume? University                       fax: +46 90 786-6614
 S-90187 Ume?, Sweden               e-mail:  gb at stat.umu.se

 http://www.stat.umu.se/~gb          ftp://capa.stat.umu.se
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