R help - Oct 2013 - Replace NA values with previous valid value in array

Hi,

c1 = (1,2,3,4,5,6,NA,7,8,NA,9,10,NA)
library(zoo)

na.locf(c1)
# [1]? 1? 2? 3? 4? 5? 6? 6? 7? 8? 8? 9 10 10

A.K.

Hi, I want to "fix" an array that contains several NA elements. And I 
would like to replace them with the previous valid element. 

So my array c = (1,2,3,4,5,6,NA,7,8,NA,9,10,NA) become cfixed=
(1,2,3,4,5,6,6,7,8,8,9,10,10)

(that's an example the actual array has thousands of elements) 

Thanks!