From: Thomas Lumley (tlumley@u.washington.edu)
Date: Wed 21 Feb 2001 - 06:52:28 EST
Message-ID: <Pine.A41.4.33.0102201250110.167086-100000@homer34.u.washington.edu>
On Tue, 20 Feb 2001, Duncan Murdoch wrote:
> I need a function that's probably already in R, but I can't find it.
>
> What I want is a "firstthat" function. This will look through a logical
> vector and return the index of the first TRUE. Typical use would be like
> this:
>
> x _ runif(100)
> x[firstthat(x > 0.8)]
>
firstthat<-function(x) min(which(x))
does roughly what you want. It returns integer infinity if
there are no matches.
-thomas
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