Re: [R] "firstthat"?

From: Peter Dalgaard BSA (p.dalgaard@pubhealth.ku.dk)
Date: Wed 21 Feb 2001 - 09:08:09 EST

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Message-ID: <x2ae7hhs12.fsf@blueberry.kubism.ku.dk>

Thomas Lumley <tlumley@u.washington.edu> writes:

> On Tue, 20 Feb 2001, Duncan Murdoch wrote:

> > 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.

Um. The result of which() is sorted, so how about

firstthat<-function(x) which(x)[1]

(gives NA if no matches)

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
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