Error on using lag function

Hello everyone, I have a vector P and I want to replace each of its
missing values by its next element, for example:
P[i] = NA --> P[i] = P[i+1]

You can also try

P[which(is.na(P))]<- P[which(is.na(P))+1]

or avoiding duplicate calculations

index.Pna<-which(is.na(P))
P[index.Pna] <- P[index.Pna+1]

You are left with having to decide what to do if the last element of P is
NA.

Berend

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