[R] how to replace NA with previous numbers
hcen at andrew.cmu.edu
Thu Nov 20 04:59:14 CET 2008
I have a vector with lots of NAs. e.g.
vec = c(NA, NA, 2, NA, NA, 5, NA, 6, NA)
 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
 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
thanks a lot
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