[R] Finding indices with a certain property

[Thomas Lumley]

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
> 
> Surely  where.negative  is something simple, but how?


which(x<0)


	-thomas

Thomas Lumley
Asssistant Professor, Biostatistics
University of Washington, Seattle

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