Message-ID: <Pine.GSO.4.21.9912070831150.8694-100000@wompom.biostat.washington.edu>
Date: 1999-12-07T16:31:43Z
From: Thomas Lumley
Subject: Finding indices with a certain property
In-Reply-To: <Pine.LNX.4.10.9912071753490.2138-100000@localhost.localdomain>
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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