[R] Finding indices with a certain property

[Göran Broström]

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?

Göran
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 Göran Broström
 Department of Statistics              tel: +46 90 786-5223
 Umeå University                       fax: +46 90 786-6614
 S-90187 Umeå, Sweden               e-mail:  gb at stat.umu.se

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