[R] fMultivar rollMax question

Omar Lakkis
2006-07-05T18:06:40Z

I am using fMultivar under R 2.2.1 on a Debian linux box. Could
someone, please, explain to me why there are two trailing NAs in the
last statement in the code beow?


> library(fMultivar)
> x <- 1:20
> rollMax(x, n=3)
 [1]  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19
20
> rollMax(x, n=2)
 [1]  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19
20
> rollMax(x, n=1)
 [1]  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 NA
NA
>