[R] how to create duplicated ID in multi-records per subject dataset

[markleeds at verizon.net]

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
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide 
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.