How about the following:
tmp <- c(-1,NA,NA,1,1,NA,NA,1)
replaceNA <- function(x){
iNA <- which(is.na(x))
if(length(iNA) %in% c(0, length(x)))
return(x)
iNA1 <- iNA-1
iNA1[iNA==0] <- length(x)
x[iNA] <- x[iNA1]
replaceNA(x)
}
> replaceNA(tmp)
[1] -1 -1 -1 1 1 1 1 1
> replaceNA(NA)
[1] NA
spencer graves
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?
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