[R] how to replace NA with previous numbers

[Gabor Grothendieck]

See na.locf in the zoo package.

On Wed, Nov 19, 2008 at 10:59 PM, jeffc <hcen at andrew.cmu.edu> wrote:
>
> Hi,
>
> I have a vector with lots of NAs. e.g.
> vec = c(NA, NA, 2, NA, NA, 5, NA, 6, NA)
>> vec
> [1] NA NA  2 NA NA  5 NA  6 NA
>
> I would like to replace NAs with their immediately previous non NA number.
> After replacement, the above vector will become
>> vec
> [1] 0 0 2 2 2 5 5 6 6.
>
> I understand  how to do that with a loop but the actual vector is very long
> and the loop takes too much time in R. Is there a good way to do the
> replacement?
>
> thanks a lot
>
> Jeff
>
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