Finding indices with a certain property

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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