[R] "firstthat"?

[Thomas Lumley]

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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