hi: change your dots to NAs and then use na.locf in the zoo package. i
didn't test it but i think that should work.
DF$ID[DF$ID == .]<-NA
DF$ID<-na.locf(DF$ID)
On Sun, Dec 14, 2008 at 8:56 PM, Zhixin Liu wrote:
Hi R helpers,
If I have a dataset looks like:
ID record 1 20
. 30
. 25
2 26
. 15
3 21
4.....................
And I want it becomes ID record 1 20
1 30
1 25
2 26
2 15
3 21
4.....................
That is, I have to duplicate IDs for those with multiple records. I am
wondering it is possible to be done in R, and I am grateful if you
would like to show me the direction.
Many thanks!
Zhixin
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