How to Interleave the items of a vector to replace NAs with preceding values in R [duplicate]

Answer 1

We can use na.locf

library(zoo)
na.locf(myvec)
#[1] "AMLM12001KP" "AMLM12001KP" "1114002"     "1114002"     "1121501"    
#[6] "1121501"     "1231401"     "1231401"     "1231401"     "1231401"