[R] Find the indices of non-NA elements of a sequence
Berend Hasselman
bhh at xs4all.nl
Fri May 17 08:51:54 CEST 2013
On 17-05-2013, at 08:36, jpm miao <miaojpm at gmail.com> wrote:
> Hi,
>
> I have a sequence whose 1st, 3rd, 4th, 6th are non-NAs. How could I let R
> return 1,3,4,6, the indices?
>
> I know only how to find the non-NA elements. Thanks,
>
> Miao
>
>> test<-c(2,NA,6,8,NA,12)
>> test[is.na(test)==FALSE]
> [1] 2 6 8 12
?which
which(!is.na(test))
Berend
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