I think what you mean is that you want to find the position of the first
non-NA value in the vector. is.na returns a boolean vector of the NA
values, so:
xx <- c(NA,NA,NA,2,3,NA,4)
> which(!is.na(xx))[1]
[1] 4
The other proposed solution,
which(diff(is.na(inc)) < 0)
is incorrect:
> which(diff(is.na(xx))<0)
[1] 3 6
-s
On Tue, Jun 23, 2009 at 10:00 AM, Alfredo Alessandrini <alfreal...@gmail.com
> wrote:
> Hi,
>
> I've a vector like this:
>
> > inc
> [1] NA NA NA NA NA NA
> NA...
> [71] NA NA NA NA NA NA NA
> [78] NA NA NA NA 13.095503 10.140119 7.989186
>
...
> I must obtain the position of first value of the vector...
>
> In this case is 82.
>
> > inc[82]
> [1] 13.09550
>
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