[R] Error on using lag function

[anna]

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]
To do this I am using the replace() and lag() functions like this:
P <- replace(as.ts(P),is.na(as.ts(P)),as.ts(lag(P,1)))
but here is the error that I get:
Warning message:
In NextMethod("[<-") :
  number of items to replace is not a multiple of replacement length
I have tried to reduce the dimension of P on the first two elements of the
replace() function by one but it wouldn't work either. Any idea?

-----
Anna Lippel
-- 
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