Message-ID: <14413.14943.620076.721493@gargle.gargle.HOWL>
Date: 1999-12-07T16:48:31Z
From: Martin Maechler
Subject: Finding indices with a certain property
In-Reply-To: <Pine.LNX.4.10.9912071753490.2138-100000@localhost.localdomain>
>>>>> "GB" == Goran Brostrom <gb at stat.umu.se> writes:
GB> I want the indices i for which x[i] < 0 (say):
>> x <- c(1, -1, 3, 3, -2) where.negative(x)
GB> [1] 2 5
GB> Surely where.negative is something simple, but how?
Yes :
which(x < 0)
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