[R] "firstthat"?

[Duncan Murdoch]

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)]

to find the first value in x that exceeds 0.8.  If there are none, it 
would give a zero length answer, or an NA, either would be fine.  I need
the index, not just the first x value, because I'll also be making use of
corresponding values of some other variables.

If that's not already there, any suggestions for how best to write it?

Duncan Murdoch


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