[R] without a loop

[Achim Zeileis]

On Tue, 7 Jun 2005 11:02:13 -0400 Omar Lakkis wrote:

> tmp <- c(-1,NA,NA,1,1,NA,NA,1)
> 
> without using a loop, how can I replace all NAs in the list above with
> the previous none NA value in the list?

Package zoo contains a generic function na.locf (last observation
carried forward) which handles this:

R> tmp <- c(-1,NA,NA,1,1,NA,NA,1)
R> library(zoo)
R> na.locf(tmp)
[1] -1 -1 -1  1  1  1  1  1

Z

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