R Under development (unstable) (2023-12-09 r85665 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> library("matrixStats")
> 
> diff2_R <- function(..., useNames = NA){
+   res <- diff(...)
+   if (is.na(useNames) || !useNames) names(res) <- NULL
+   res
+ }
> 
> set.seed(0x42)
> 
> for (mode in c("integer", "double")) {
+   x <- rnorm(10, sd = 5)
+   storage.mode(x) <- mode
+   str(x)
+ 
+   for (has_na in c(FALSE, TRUE)) {
+     for (setNames in c(TRUE, FALSE)) {
+       for (useNames in c(if (!matrixStats:::isUseNamesNADefunct()) NA, TRUE, FALSE)) {
+         if (has_na) {
+           x[sample(1:10, size = 3)] <- NA
+         }
+         if (setNames) {
+           names(x) <- LETTERS[1:10]
+         }
+         for (l in 1:3) {
+           for (d in 1:4) {
+             cat(sprintf("%s: NAs = %s, lag = %d, differences = %d, setNames = %d, useNames = %d\n",
+                         mode, has_na, l, d, setNames, useNames))
+             y0 <- diff2_R(x, lag = l, differences = d, useNames = useNames)
+             str(y0)
+             y1 <- diff2(x, lag = l, differences = d, useNames = useNames)
+             str(y1)
+             stopifnot(identical(y1, y0))
+           }
+         }  
+       }
+     }
+   } # for (has_na ...)
+ }
 int [1:10] 11 1 2 0 -1 -3 -3 6 0 0
integer: NAs = FALSE, lag = 1, differences = 1, setNames = 1, useNames = 1
 Named int [1:9] -10 1 -2 -1 -2 0 9 -6 0
 - attr(*, "names")= chr [1:9] "B" "C" "D" "E" ...
 Named int [1:9] -10 1 -2 -1 -2 0 9 -6 0
 - attr(*, "names")= chr [1:9] "B" "C" "D" "E" ...
integer: NAs = FALSE, lag = 1, differences = 2, setNames = 1, useNames = 1
 Named int [1:8] 11 -3 1 -1 2 9 -15 6
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
 Named int [1:8] 11 -3 1 -1 2 9 -15 6
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
integer: NAs = FALSE, lag = 1, differences = 3, setNames = 1, useNames = 1
 Named int [1:7] -14 4 -2 3 7 -24 21
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
 Named int [1:7] -14 4 -2 3 7 -24 21
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
integer: NAs = FALSE, lag = 1, differences = 4, setNames = 1, useNames = 1
 Named int [1:6] 18 -6 5 4 -31 45
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
 Named int [1:6] 18 -6 5 4 -31 45
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
integer: NAs = FALSE, lag = 2, differences = 1, setNames = 1, useNames = 1
 Named int [1:8] -9 -1 -3 -3 -2 9 3 -6
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
 Named int [1:8] -9 -1 -3 -3 -2 9 3 -6
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
integer: NAs = FALSE, lag = 2, differences = 2, setNames = 1, useNames = 1
 Named int [1:6] 6 -2 1 12 5 -15
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
 Named int [1:6] 6 -2 1 12 5 -15
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
integer: NAs = FALSE, lag = 2, differences = 3, setNames = 1, useNames = 1
 Named int [1:4] -5 14 4 -27
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
 Named int [1:4] -5 14 4 -27
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
integer: NAs = FALSE, lag = 2, differences = 4, setNames = 1, useNames = 1
 Named int [1:2] 9 -41
 - attr(*, "names")= chr [1:2] "I" "J"
 Named int [1:2] 9 -41
 - attr(*, "names")= chr [1:2] "I" "J"
integer: NAs = FALSE, lag = 3, differences = 1, setNames = 1, useNames = 1
 Named int [1:7] -11 -2 -5 -3 7 3 3
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
 Named int [1:7] -11 -2 -5 -3 7 3 3
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
integer: NAs = FALSE, lag = 3, differences = 2, setNames = 1, useNames = 1
 Named int [1:4] 8 9 8 6
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
 Named int [1:4] 8 9 8 6
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
integer: NAs = FALSE, lag = 3, differences = 3, setNames = 1, useNames = 1
 Named int -2
 - attr(*, "names")= chr "J"
 Named int -2
 - attr(*, "names")= chr "J"
integer: NAs = FALSE, lag = 3, differences = 4, setNames = 1, useNames = 1
 Named int(0) 
 - attr(*, "names")= chr(0) 
 Named int(0) 
 - attr(*, "names")= chr(0) 
integer: NAs = FALSE, lag = 1, differences = 1, setNames = 1, useNames = 0
 int [1:9] -10 1 -2 -1 -2 0 9 -6 0
 int [1:9] -10 1 -2 -1 -2 0 9 -6 0
integer: NAs = FALSE, lag = 1, differences = 2, setNames = 1, useNames = 0
 int [1:8] 11 -3 1 -1 2 9 -15 6
 int [1:8] 11 -3 1 -1 2 9 -15 6
integer: NAs = FALSE, lag = 1, differences = 3, setNames = 1, useNames = 0
 int [1:7] -14 4 -2 3 7 -24 21
 int [1:7] -14 4 -2 3 7 -24 21
integer: NAs = FALSE, lag = 1, differences = 4, setNames = 1, useNames = 0
 int [1:6] 18 -6 5 4 -31 45
 int [1:6] 18 -6 5 4 -31 45
integer: NAs = FALSE, lag = 2, differences = 1, setNames = 1, useNames = 0
 int [1:8] -9 -1 -3 -3 -2 9 3 -6
 int [1:8] -9 -1 -3 -3 -2 9 3 -6
integer: NAs = FALSE, lag = 2, differences = 2, setNames = 1, useNames = 0
 int [1:6] 6 -2 1 12 5 -15
 int [1:6] 6 -2 1 12 5 -15
integer: NAs = FALSE, lag = 2, differences = 3, setNames = 1, useNames = 0
 int [1:4] -5 14 4 -27
 int [1:4] -5 14 4 -27
integer: NAs = FALSE, lag = 2, differences = 4, setNames = 1, useNames = 0
 int [1:2] 9 -41
 int [1:2] 9 -41
integer: NAs = FALSE, lag = 3, differences = 1, setNames = 1, useNames = 0
 int [1:7] -11 -2 -5 -3 7 3 3
 int [1:7] -11 -2 -5 -3 7 3 3
integer: NAs = FALSE, lag = 3, differences = 2, setNames = 1, useNames = 0
 int [1:4] 8 9 8 6
 int [1:4] 8 9 8 6
integer: NAs = FALSE, lag = 3, differences = 3, setNames = 1, useNames = 0
 int -2
 int -2
integer: NAs = FALSE, lag = 3, differences = 4, setNames = 1, useNames = 0
 int(0) 
 int(0) 
integer: NAs = FALSE, lag = 1, differences = 1, setNames = 0, useNames = 1
 Named int [1:9] -10 1 -2 -1 -2 0 9 -6 0
 - attr(*, "names")= chr [1:9] "B" "C" "D" "E" ...
 Named int [1:9] -10 1 -2 -1 -2 0 9 -6 0
 - attr(*, "names")= chr [1:9] "B" "C" "D" "E" ...
integer: NAs = FALSE, lag = 1, differences = 2, setNames = 0, useNames = 1
 Named int [1:8] 11 -3 1 -1 2 9 -15 6
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
 Named int [1:8] 11 -3 1 -1 2 9 -15 6
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
integer: NAs = FALSE, lag = 1, differences = 3, setNames = 0, useNames = 1
 Named int [1:7] -14 4 -2 3 7 -24 21
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
 Named int [1:7] -14 4 -2 3 7 -24 21
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
integer: NAs = FALSE, lag = 1, differences = 4, setNames = 0, useNames = 1
 Named int [1:6] 18 -6 5 4 -31 45
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
 Named int [1:6] 18 -6 5 4 -31 45
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
integer: NAs = FALSE, lag = 2, differences = 1, setNames = 0, useNames = 1
 Named int [1:8] -9 -1 -3 -3 -2 9 3 -6
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
 Named int [1:8] -9 -1 -3 -3 -2 9 3 -6
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
integer: NAs = FALSE, lag = 2, differences = 2, setNames = 0, useNames = 1
 Named int [1:6] 6 -2 1 12 5 -15
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
 Named int [1:6] 6 -2 1 12 5 -15
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
integer: NAs = FALSE, lag = 2, differences = 3, setNames = 0, useNames = 1
 Named int [1:4] -5 14 4 -27
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
 Named int [1:4] -5 14 4 -27
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
integer: NAs = FALSE, lag = 2, differences = 4, setNames = 0, useNames = 1
 Named int [1:2] 9 -41
 - attr(*, "names")= chr [1:2] "I" "J"
 Named int [1:2] 9 -41
 - attr(*, "names")= chr [1:2] "I" "J"
integer: NAs = FALSE, lag = 3, differences = 1, setNames = 0, useNames = 1
 Named int [1:7] -11 -2 -5 -3 7 3 3
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
 Named int [1:7] -11 -2 -5 -3 7 3 3
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
integer: NAs = FALSE, lag = 3, differences = 2, setNames = 0, useNames = 1
 Named int [1:4] 8 9 8 6
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
 Named int [1:4] 8 9 8 6
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
integer: NAs = FALSE, lag = 3, differences = 3, setNames = 0, useNames = 1
 Named int -2
 - attr(*, "names")= chr "J"
 Named int -2
 - attr(*, "names")= chr "J"
integer: NAs = FALSE, lag = 3, differences = 4, setNames = 0, useNames = 1
 Named int(0) 
 - attr(*, "names")= chr(0) 
 Named int(0) 
 - attr(*, "names")= chr(0) 
integer: NAs = FALSE, lag = 1, differences = 1, setNames = 0, useNames = 0
 int [1:9] -10 1 -2 -1 -2 0 9 -6 0
 int [1:9] -10 1 -2 -1 -2 0 9 -6 0
integer: NAs = FALSE, lag = 1, differences = 2, setNames = 0, useNames = 0
 int [1:8] 11 -3 1 -1 2 9 -15 6
 int [1:8] 11 -3 1 -1 2 9 -15 6
integer: NAs = FALSE, lag = 1, differences = 3, setNames = 0, useNames = 0
 int [1:7] -14 4 -2 3 7 -24 21
 int [1:7] -14 4 -2 3 7 -24 21
integer: NAs = FALSE, lag = 1, differences = 4, setNames = 0, useNames = 0
 int [1:6] 18 -6 5 4 -31 45
 int [1:6] 18 -6 5 4 -31 45
integer: NAs = FALSE, lag = 2, differences = 1, setNames = 0, useNames = 0
 int [1:8] -9 -1 -3 -3 -2 9 3 -6
 int [1:8] -9 -1 -3 -3 -2 9 3 -6
integer: NAs = FALSE, lag = 2, differences = 2, setNames = 0, useNames = 0
 int [1:6] 6 -2 1 12 5 -15
 int [1:6] 6 -2 1 12 5 -15
integer: NAs = FALSE, lag = 2, differences = 3, setNames = 0, useNames = 0
 int [1:4] -5 14 4 -27
 int [1:4] -5 14 4 -27
integer: NAs = FALSE, lag = 2, differences = 4, setNames = 0, useNames = 0
 int [1:2] 9 -41
 int [1:2] 9 -41
integer: NAs = FALSE, lag = 3, differences = 1, setNames = 0, useNames = 0
 int [1:7] -11 -2 -5 -3 7 3 3
 int [1:7] -11 -2 -5 -3 7 3 3
integer: NAs = FALSE, lag = 3, differences = 2, setNames = 0, useNames = 0
 int [1:4] 8 9 8 6
 int [1:4] 8 9 8 6
integer: NAs = FALSE, lag = 3, differences = 3, setNames = 0, useNames = 0
 int -2
 int -2
integer: NAs = FALSE, lag = 3, differences = 4, setNames = 0, useNames = 0
 int(0) 
 int(0) 
integer: NAs = TRUE, lag = 1, differences = 1, setNames = 1, useNames = 1
 Named int [1:9] NA NA NA NA NA 0 9 -6 0
 - attr(*, "names")= chr [1:9] "B" "C" "D" "E" ...
 Named int [1:9] NA NA NA NA NA 0 9 -6 0
 - attr(*, "names")= chr [1:9] "B" "C" "D" "E" ...
integer: NAs = TRUE, lag = 1, differences = 2, setNames = 1, useNames = 1
 Named int [1:8] NA NA NA NA NA 9 -15 6
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
 Named int [1:8] NA NA NA NA NA 9 -15 6
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
integer: NAs = TRUE, lag = 1, differences = 3, setNames = 1, useNames = 1
 Named int [1:7] NA NA NA NA NA -24 21
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
 Named int [1:7] NA NA NA NA NA -24 21
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
integer: NAs = TRUE, lag = 1, differences = 4, setNames = 1, useNames = 1
 Named int [1:6] NA NA NA NA NA 45
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
 Named int [1:6] NA NA NA NA NA 45
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
integer: NAs = TRUE, lag = 2, differences = 1, setNames = 1, useNames = 1
 Named int [1:8] -9 NA NA NA NA 9 3 -6
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
 Named int [1:8] -9 NA NA NA NA 9 3 -6
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
integer: NAs = TRUE, lag = 2, differences = 2, setNames = 1, useNames = 1
 Named int [1:6] NA NA NA NA NA -15
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
 Named int [1:6] NA NA NA NA NA -15
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
integer: NAs = TRUE, lag = 2, differences = 3, setNames = 1, useNames = 1
 Named int [1:4] NA NA NA NA
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
 Named int [1:4] NA NA NA NA
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
integer: NAs = TRUE, lag = 2, differences = 4, setNames = 1, useNames = 1
 Named int [1:2] NA NA
 - attr(*, "names")= chr [1:2] "I" "J"
 Named int [1:2] NA NA
 - attr(*, "names")= chr [1:2] "I" "J"
integer: NAs = TRUE, lag = 3, differences = 1, setNames = 1, useNames = 1
 Named int [1:7] NA NA -5 NA NA 3 3
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
 Named int [1:7] NA NA -5 NA NA 3 3
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
integer: NAs = TRUE, lag = 3, differences = 2, setNames = 1, useNames = 1
 Named int [1:4] NA NA 8 NA
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
 Named int [1:4] NA NA 8 NA
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
integer: NAs = TRUE, lag = 3, differences = 3, setNames = 1, useNames = 1
 Named int NA
 - attr(*, "names")= chr "J"
 Named int NA
 - attr(*, "names")= chr "J"
integer: NAs = TRUE, lag = 3, differences = 4, setNames = 1, useNames = 1
 Named int(0) 
 - attr(*, "names")= chr(0) 
 Named int(0) 
 - attr(*, "names")= chr(0) 
integer: NAs = TRUE, lag = 1, differences = 1, setNames = 1, useNames = 0
 int [1:9] NA NA NA NA NA 0 9 NA NA
 int [1:9] NA NA NA NA NA 0 9 NA NA
integer: NAs = TRUE, lag = 1, differences = 2, setNames = 1, useNames = 0
 int [1:8] NA NA NA NA NA 9 NA NA
 int [1:8] NA NA NA NA NA 9 NA NA
integer: NAs = TRUE, lag = 1, differences = 3, setNames = 1, useNames = 0
 int [1:7] NA NA NA NA NA NA NA
 int [1:7] NA NA NA NA NA NA NA
integer: NAs = TRUE, lag = 1, differences = 4, setNames = 1, useNames = 0
 int [1:6] NA NA NA NA NA NA
 int [1:6] NA NA NA NA NA NA
integer: NAs = TRUE, lag = 2, differences = 1, setNames = 1, useNames = 0
 int [1:8] NA NA NA NA NA 9 NA -6
 int [1:8] NA NA NA NA NA 9 NA -6
integer: NAs = TRUE, lag = 2, differences = 2, setNames = 1, useNames = 0
 int [1:6] NA NA NA NA NA -15
 int [1:6] NA NA NA NA NA -15
integer: NAs = TRUE, lag = 2, differences = 3, setNames = 1, useNames = 0
 int [1:4] NA NA NA NA
 int [1:4] NA NA NA NA
integer: NAs = TRUE, lag = 2, differences = 4, setNames = 1, useNames = 0
 int [1:2] NA NA
 int [1:2] NA NA
integer: NAs = TRUE, lag = 3, differences = 1, setNames = 1, useNames = 0
 int [1:7] NA NA NA NA NA NA 3
 int [1:7] NA NA NA NA NA NA 3
integer: NAs = TRUE, lag = 3, differences = 2, setNames = 1, useNames = 0
 int [1:4] NA NA NA NA
 int [1:4] NA NA NA NA
integer: NAs = TRUE, lag = 3, differences = 3, setNames = 1, useNames = 0
 int NA
 int NA
integer: NAs = TRUE, lag = 3, differences = 4, setNames = 1, useNames = 0
 int(0) 
 int(0) 
integer: NAs = TRUE, lag = 1, differences = 1, setNames = 0, useNames = 1
 Named int [1:9] NA NA NA NA NA NA NA NA NA
 - attr(*, "names")= chr [1:9] "B" "C" "D" "E" ...
 Named int [1:9] NA NA NA NA NA NA NA NA NA
 - attr(*, "names")= chr [1:9] "B" "C" "D" "E" ...
integer: NAs = TRUE, lag = 1, differences = 2, setNames = 0, useNames = 1
 Named int [1:8] NA NA NA NA NA NA NA NA
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
 Named int [1:8] NA NA NA NA NA NA NA NA
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
integer: NAs = TRUE, lag = 1, differences = 3, setNames = 0, useNames = 1
 Named int [1:7] NA NA NA NA NA NA NA
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
 Named int [1:7] NA NA NA NA NA NA NA
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
integer: NAs = TRUE, lag = 1, differences = 4, setNames = 0, useNames = 1
 Named int [1:6] NA NA NA NA NA NA
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
 Named int [1:6] NA NA NA NA NA NA
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
integer: NAs = TRUE, lag = 2, differences = 1, setNames = 0, useNames = 1
 Named int [1:8] NA NA NA NA NA NA NA NA
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
 Named int [1:8] NA NA NA NA NA NA NA NA
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
integer: NAs = TRUE, lag = 2, differences = 2, setNames = 0, useNames = 1
 Named int [1:6] NA NA NA NA NA NA
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
 Named int [1:6] NA NA NA NA NA NA
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
integer: NAs = TRUE, lag = 2, differences = 3, setNames = 0, useNames = 1
 Named int [1:4] NA NA NA NA
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
 Named int [1:4] NA NA NA NA
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
integer: NAs = TRUE, lag = 2, differences = 4, setNames = 0, useNames = 1
 Named int [1:2] NA NA
 - attr(*, "names")= chr [1:2] "I" "J"
 Named int [1:2] NA NA
 - attr(*, "names")= chr [1:2] "I" "J"
integer: NAs = TRUE, lag = 3, differences = 1, setNames = 0, useNames = 1
 Named int [1:7] NA NA NA NA NA NA 3
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
 Named int [1:7] NA NA NA NA NA NA 3
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
integer: NAs = TRUE, lag = 3, differences = 2, setNames = 0, useNames = 1
 Named int [1:4] NA NA NA NA
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
 Named int [1:4] NA NA NA NA
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
integer: NAs = TRUE, lag = 3, differences = 3, setNames = 0, useNames = 1
 Named int NA
 - attr(*, "names")= chr "J"
 Named int NA
 - attr(*, "names")= chr "J"
integer: NAs = TRUE, lag = 3, differences = 4, setNames = 0, useNames = 1
 Named int(0) 
 - attr(*, "names")= chr(0) 
 Named int(0) 
 - attr(*, "names")= chr(0) 
integer: NAs = TRUE, lag = 1, differences = 1, setNames = 0, useNames = 0
 int [1:9] NA NA NA NA NA NA NA NA NA
 int [1:9] NA NA NA NA NA NA NA NA NA
integer: NAs = TRUE, lag = 1, differences = 2, setNames = 0, useNames = 0
 int [1:8] NA NA NA NA NA NA NA NA
 int [1:8] NA NA NA NA NA NA NA NA
integer: NAs = TRUE, lag = 1, differences = 3, setNames = 0, useNames = 0
 int [1:7] NA NA NA NA NA NA NA
 int [1:7] NA NA NA NA NA NA NA
integer: NAs = TRUE, lag = 1, differences = 4, setNames = 0, useNames = 0
 int [1:6] NA NA NA NA NA NA
 int [1:6] NA NA NA NA NA NA
integer: NAs = TRUE, lag = 2, differences = 1, setNames = 0, useNames = 0
 int [1:8] NA NA NA NA NA NA NA NA
 int [1:8] NA NA NA NA NA NA NA NA
integer: NAs = TRUE, lag = 2, differences = 2, setNames = 0, useNames = 0
 int [1:6] NA NA NA NA NA NA
 int [1:6] NA NA NA NA NA NA
integer: NAs = TRUE, lag = 2, differences = 3, setNames = 0, useNames = 0
 int [1:4] NA NA NA NA
 int [1:4] NA NA NA NA
integer: NAs = TRUE, lag = 2, differences = 4, setNames = 0, useNames = 0
 int [1:2] NA NA
 int [1:2] NA NA
integer: NAs = TRUE, lag = 3, differences = 1, setNames = 0, useNames = 0
 int [1:7] NA NA NA NA NA NA 3
 int [1:7] NA NA NA NA NA NA 3
integer: NAs = TRUE, lag = 3, differences = 2, setNames = 0, useNames = 0
 int [1:4] NA NA NA NA
 int [1:4] NA NA NA NA
integer: NAs = TRUE, lag = 3, differences = 3, setNames = 0, useNames = 0
 int NA
 int NA
integer: NAs = TRUE, lag = 3, differences = 4, setNames = 0, useNames = 0
 int(0) 
 int(0) 
 num [1:10] 2.586 -0.344 0.33 9.155 -3.254 ...
double: NAs = FALSE, lag = 1, differences = 1, setNames = 1, useNames = 1
 Named num [1:9] -2.929 0.673 8.826 -12.409 -1.221 ...
 - attr(*, "names")= chr [1:9] "B" "C" "D" "E" ...
 Named num [1:9] -2.929 0.673 8.826 -12.409 -1.221 ...
 - attr(*, "names")= chr [1:9] "B" "C" "D" "E" ...
double: NAs = FALSE, lag = 1, differences = 2, setNames = 1, useNames = 1
 Named num [1:8] 3.6 8.15 -21.23 11.19 -2.1 ...
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
 Named num [1:8] 3.6 8.15 -21.23 11.19 -2.1 ...
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
double: NAs = FALSE, lag = 1, differences = 3, setNames = 1, useNames = 1
 Named num [1:7] 4.55 -29.39 32.42 -13.29 14.97 ...
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
 Named num [1:7] 4.55 -29.39 32.42 -13.29 14.97 ...
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
double: NAs = FALSE, lag = 1, differences = 4, setNames = 1, useNames = 1
 Named num [1:6] -33.9 61.8 -45.7 28.3 -37 ...
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
 Named num [1:6] -33.9 61.8 -45.7 28.3 -37 ...
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
double: NAs = FALSE, lag = 2, differences = 1, setNames = 1, useNames = 1
 Named num [1:8] -2.26 9.5 -3.58 -13.63 -4.54 ...
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
 Named num [1:8] -2.26 9.5 -3.58 -13.63 -4.54 ...
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
double: NAs = FALSE, lag = 2, differences = 2, setNames = 1, useNames = 1
 Named num [1:6] -1.33 -23.13 -0.96 19.86 14.44 ...
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
 Named num [1:6] -1.33 -23.13 -0.96 19.86 14.44 ...
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
double: NAs = FALSE, lag = 2, differences = 3, setNames = 1, useNames = 1
 Named num [1:4] 0.368 42.988 15.396 -29.313
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
 Named num [1:4] 0.368 42.988 15.396 -29.313
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
double: NAs = FALSE, lag = 2, differences = 4, setNames = 1, useNames = 1
 Named num [1:2] 15 -72.3
 - attr(*, "names")= chr [1:2] "I" "J"
 Named num [1:2] 15 -72.3
 - attr(*, "names")= chr [1:2] "I" "J"
double: NAs = FALSE, lag = 3, differences = 1, setNames = 1, useNames = 1
 Named num [1:7] 6.57 -2.91 -4.81 -16.95 5.01 ...
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
 Named num [1:7] 6.57 -2.91 -4.81 -16.95 5.01 ...
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
double: NAs = FALSE, lag = 3, differences = 2, setNames = 1, useNames = 1
 Named num [1:4] -23.52 7.92 11.38 23.27
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
 Named num [1:4] -23.52 7.92 11.38 23.27
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
double: NAs = FALSE, lag = 3, differences = 3, setNames = 1, useNames = 1
 Named num 46.8
 - attr(*, "names")= chr "J"
 Named num 46.8
 - attr(*, "names")= chr "J"
double: NAs = FALSE, lag = 3, differences = 4, setNames = 1, useNames = 1
 Named num(0) 
 - attr(*, "names")= chr(0) 
 Named num(0) 
 - attr(*, "names")= chr(0) 
double: NAs = FALSE, lag = 1, differences = 1, setNames = 1, useNames = 0
 num [1:9] -2.929 0.673 8.826 -12.409 -1.221 ...
 num [1:9] -2.929 0.673 8.826 -12.409 -1.221 ...
double: NAs = FALSE, lag = 1, differences = 2, setNames = 1, useNames = 0
 num [1:8] 3.6 8.15 -21.23 11.19 -2.1 ...
 num [1:8] 3.6 8.15 -21.23 11.19 -2.1 ...
double: NAs = FALSE, lag = 1, differences = 3, setNames = 1, useNames = 0
 num [1:7] 4.55 -29.39 32.42 -13.29 14.97 ...
 num [1:7] 4.55 -29.39 32.42 -13.29 14.97 ...
double: NAs = FALSE, lag = 1, differences = 4, setNames = 1, useNames = 0
 num [1:6] -33.9 61.8 -45.7 28.3 -37 ...
 num [1:6] -33.9 61.8 -45.7 28.3 -37 ...
double: NAs = FALSE, lag = 2, differences = 1, setNames = 1, useNames = 0
 num [1:8] -2.26 9.5 -3.58 -13.63 -4.54 ...
 num [1:8] -2.26 9.5 -3.58 -13.63 -4.54 ...
double: NAs = FALSE, lag = 2, differences = 2, setNames = 1, useNames = 0
 num [1:6] -1.33 -23.13 -0.96 19.86 14.44 ...
 num [1:6] -1.33 -23.13 -0.96 19.86 14.44 ...
double: NAs = FALSE, lag = 2, differences = 3, setNames = 1, useNames = 0
 num [1:4] 0.368 42.988 15.396 -29.313
 num [1:4] 0.368 42.988 15.396 -29.313
double: NAs = FALSE, lag = 2, differences = 4, setNames = 1, useNames = 0
 num [1:2] 15 -72.3
 num [1:2] 15 -72.3
double: NAs = FALSE, lag = 3, differences = 1, setNames = 1, useNames = 0
 num [1:7] 6.57 -2.91 -4.81 -16.95 5.01 ...
 num [1:7] 6.57 -2.91 -4.81 -16.95 5.01 ...
double: NAs = FALSE, lag = 3, differences = 2, setNames = 1, useNames = 0
 num [1:4] -23.52 7.92 11.38 23.27
 num [1:4] -23.52 7.92 11.38 23.27
double: NAs = FALSE, lag = 3, differences = 3, setNames = 1, useNames = 0
 num 46.8
 num 46.8
double: NAs = FALSE, lag = 3, differences = 4, setNames = 1, useNames = 0
 num(0) 
 num(0) 
double: NAs = FALSE, lag = 1, differences = 1, setNames = 0, useNames = 1
 Named num [1:9] -2.929 0.673 8.826 -12.409 -1.221 ...
 - attr(*, "names")= chr [1:9] "B" "C" "D" "E" ...
 Named num [1:9] -2.929 0.673 8.826 -12.409 -1.221 ...
 - attr(*, "names")= chr [1:9] "B" "C" "D" "E" ...
double: NAs = FALSE, lag = 1, differences = 2, setNames = 0, useNames = 1
 Named num [1:8] 3.6 8.15 -21.23 11.19 -2.1 ...
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
 Named num [1:8] 3.6 8.15 -21.23 11.19 -2.1 ...
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
double: NAs = FALSE, lag = 1, differences = 3, setNames = 0, useNames = 1
 Named num [1:7] 4.55 -29.39 32.42 -13.29 14.97 ...
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
 Named num [1:7] 4.55 -29.39 32.42 -13.29 14.97 ...
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
double: NAs = FALSE, lag = 1, differences = 4, setNames = 0, useNames = 1
 Named num [1:6] -33.9 61.8 -45.7 28.3 -37 ...
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
 Named num [1:6] -33.9 61.8 -45.7 28.3 -37 ...
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
double: NAs = FALSE, lag = 2, differences = 1, setNames = 0, useNames = 1
 Named num [1:8] -2.26 9.5 -3.58 -13.63 -4.54 ...
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
 Named num [1:8] -2.26 9.5 -3.58 -13.63 -4.54 ...
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
double: NAs = FALSE, lag = 2, differences = 2, setNames = 0, useNames = 1
 Named num [1:6] -1.33 -23.13 -0.96 19.86 14.44 ...
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
 Named num [1:6] -1.33 -23.13 -0.96 19.86 14.44 ...
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
double: NAs = FALSE, lag = 2, differences = 3, setNames = 0, useNames = 1
 Named num [1:4] 0.368 42.988 15.396 -29.313
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
 Named num [1:4] 0.368 42.988 15.396 -29.313
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
double: NAs = FALSE, lag = 2, differences = 4, setNames = 0, useNames = 1
 Named num [1:2] 15 -72.3
 - attr(*, "names")= chr [1:2] "I" "J"
 Named num [1:2] 15 -72.3
 - attr(*, "names")= chr [1:2] "I" "J"
double: NAs = FALSE, lag = 3, differences = 1, setNames = 0, useNames = 1
 Named num [1:7] 6.57 -2.91 -4.81 -16.95 5.01 ...
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
 Named num [1:7] 6.57 -2.91 -4.81 -16.95 5.01 ...
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
double: NAs = FALSE, lag = 3, differences = 2, setNames = 0, useNames = 1
 Named num [1:4] -23.52 7.92 11.38 23.27
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
 Named num [1:4] -23.52 7.92 11.38 23.27
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
double: NAs = FALSE, lag = 3, differences = 3, setNames = 0, useNames = 1
 Named num 46.8
 - attr(*, "names")= chr "J"
 Named num 46.8
 - attr(*, "names")= chr "J"
double: NAs = FALSE, lag = 3, differences = 4, setNames = 0, useNames = 1
 Named num(0) 
 - attr(*, "names")= chr(0) 
 Named num(0) 
 - attr(*, "names")= chr(0) 
double: NAs = FALSE, lag = 1, differences = 1, setNames = 0, useNames = 0
 num [1:9] -2.929 0.673 8.826 -12.409 -1.221 ...
 num [1:9] -2.929 0.673 8.826 -12.409 -1.221 ...
double: NAs = FALSE, lag = 1, differences = 2, setNames = 0, useNames = 0
 num [1:8] 3.6 8.15 -21.23 11.19 -2.1 ...
 num [1:8] 3.6 8.15 -21.23 11.19 -2.1 ...
double: NAs = FALSE, lag = 1, differences = 3, setNames = 0, useNames = 0
 num [1:7] 4.55 -29.39 32.42 -13.29 14.97 ...
 num [1:7] 4.55 -29.39 32.42 -13.29 14.97 ...
double: NAs = FALSE, lag = 1, differences = 4, setNames = 0, useNames = 0
 num [1:6] -33.9 61.8 -45.7 28.3 -37 ...
 num [1:6] -33.9 61.8 -45.7 28.3 -37 ...
double: NAs = FALSE, lag = 2, differences = 1, setNames = 0, useNames = 0
 num [1:8] -2.26 9.5 -3.58 -13.63 -4.54 ...
 num [1:8] -2.26 9.5 -3.58 -13.63 -4.54 ...
double: NAs = FALSE, lag = 2, differences = 2, setNames = 0, useNames = 0
 num [1:6] -1.33 -23.13 -0.96 19.86 14.44 ...
 num [1:6] -1.33 -23.13 -0.96 19.86 14.44 ...
double: NAs = FALSE, lag = 2, differences = 3, setNames = 0, useNames = 0
 num [1:4] 0.368 42.988 15.396 -29.313
 num [1:4] 0.368 42.988 15.396 -29.313
double: NAs = FALSE, lag = 2, differences = 4, setNames = 0, useNames = 0
 num [1:2] 15 -72.3
 num [1:2] 15 -72.3
double: NAs = FALSE, lag = 3, differences = 1, setNames = 0, useNames = 0
 num [1:7] 6.57 -2.91 -4.81 -16.95 5.01 ...
 num [1:7] 6.57 -2.91 -4.81 -16.95 5.01 ...
double: NAs = FALSE, lag = 3, differences = 2, setNames = 0, useNames = 0
 num [1:4] -23.52 7.92 11.38 23.27
 num [1:4] -23.52 7.92 11.38 23.27
double: NAs = FALSE, lag = 3, differences = 3, setNames = 0, useNames = 0
 num 46.8
 num 46.8
double: NAs = FALSE, lag = 3, differences = 4, setNames = 0, useNames = 0
 num(0) 
 num(0) 
double: NAs = TRUE, lag = 1, differences = 1, setNames = 1, useNames = 1
 Named num [1:9] -2.929 0.673 8.826 NA NA ...
 - attr(*, "names")= chr [1:9] "B" "C" "D" "E" ...
 Named num [1:9] -2.929 0.673 8.826 NA NA ...
 - attr(*, "names")= chr [1:9] "B" "C" "D" "E" ...
double: NAs = TRUE, lag = 1, differences = 2, setNames = 1, useNames = 1
 Named num [1:8] 3.6 8.15 NA NA NA ...
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
 Named num [1:8] 3.6 8.15 NA NA NA ...
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
double: NAs = TRUE, lag = 1, differences = 3, setNames = 1, useNames = 1
 Named num [1:7] 4.55 NA NA NA NA ...
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
 Named num [1:7] 4.55 NA NA NA NA ...
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
double: NAs = TRUE, lag = 1, differences = 4, setNames = 1, useNames = 1
 Named num [1:6] NA NA NA NA NA NA
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
 Named num [1:6] NA NA NA NA NA NA
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
double: NAs = TRUE, lag = 2, differences = 1, setNames = 1, useNames = 1
 Named num [1:8] -2.26 9.5 NA NA NA ...
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
 Named num [1:8] -2.26 9.5 NA NA NA ...
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
double: NAs = TRUE, lag = 2, differences = 2, setNames = 1, useNames = 1
 Named num [1:6] NA NA NA NA NA NA
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
 Named num [1:6] NA NA NA NA NA NA
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
double: NAs = TRUE, lag = 2, differences = 3, setNames = 1, useNames = 1
 Named num [1:4] NA NA NA NA
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
 Named num [1:4] NA NA NA NA
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
double: NAs = TRUE, lag = 2, differences = 4, setNames = 1, useNames = 1
 Named num [1:2] NA NA
 - attr(*, "names")= chr [1:2] "I" "J"
 Named num [1:2] NA NA
 - attr(*, "names")= chr [1:2] "I" "J"
double: NAs = TRUE, lag = 3, differences = 1, setNames = 1, useNames = 1
 Named num [1:7] 6.57 NA NA -16.95 NA ...
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
 Named num [1:7] 6.57 NA NA -16.95 NA ...
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
double: NAs = TRUE, lag = 3, differences = 2, setNames = 1, useNames = 1
 Named num [1:4] -23.5 NA NA 23.3
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
 Named num [1:4] -23.5 NA NA 23.3
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
double: NAs = TRUE, lag = 3, differences = 3, setNames = 1, useNames = 1
 Named num 46.8
 - attr(*, "names")= chr "J"
 Named num 46.8
 - attr(*, "names")= chr "J"
double: NAs = TRUE, lag = 3, differences = 4, setNames = 1, useNames = 1
 Named num(0) 
 - attr(*, "names")= chr(0) 
 Named num(0) 
 - attr(*, "names")= chr(0) 
double: NAs = TRUE, lag = 1, differences = 1, setNames = 1, useNames = 0
 num [1:9] NA 0.673 8.826 NA NA ...
 num [1:9] NA 0.673 8.826 NA NA ...
double: NAs = TRUE, lag = 1, differences = 2, setNames = 1, useNames = 0
 num [1:8] NA 8.15 NA NA NA ...
 num [1:8] NA 8.15 NA NA NA ...
double: NAs = TRUE, lag = 1, differences = 3, setNames = 1, useNames = 0
 num [1:7] NA NA NA NA NA NA NA
 num [1:7] NA NA NA NA NA NA NA
double: NAs = TRUE, lag = 1, differences = 4, setNames = 1, useNames = 0
 num [1:6] NA NA NA NA NA NA
 num [1:6] NA NA NA NA NA NA
double: NAs = TRUE, lag = 2, differences = 1, setNames = 1, useNames = 0
 num [1:8] NA 9.5 NA NA NA ...
 num [1:8] NA 9.5 NA NA NA ...
double: NAs = TRUE, lag = 2, differences = 2, setNames = 1, useNames = 0
 num [1:6] NA NA NA NA NA NA
 num [1:6] NA NA NA NA NA NA
double: NAs = TRUE, lag = 2, differences = 3, setNames = 1, useNames = 0
 num [1:4] NA NA NA NA
 num [1:4] NA NA NA NA
double: NAs = TRUE, lag = 2, differences = 4, setNames = 1, useNames = 0
 num [1:2] NA NA
 num [1:2] NA NA
double: NAs = TRUE, lag = 3, differences = 1, setNames = 1, useNames = 0
 num [1:7] NA NA NA NA NA NA NA
 num [1:7] NA NA NA NA NA NA NA
double: NAs = TRUE, lag = 3, differences = 2, setNames = 1, useNames = 0
 num [1:4] NA NA NA NA
 num [1:4] NA NA NA NA
double: NAs = TRUE, lag = 3, differences = 3, setNames = 1, useNames = 0
 num NA
 num NA
double: NAs = TRUE, lag = 3, differences = 4, setNames = 1, useNames = 0
 num(0) 
 num(0) 
double: NAs = TRUE, lag = 1, differences = 1, setNames = 0, useNames = 1
 Named num [1:9] NA 0.673 8.826 NA NA ...
 - attr(*, "names")= chr [1:9] "B" "C" "D" "E" ...
 Named num [1:9] NA 0.673 8.826 NA NA ...
 - attr(*, "names")= chr [1:9] "B" "C" "D" "E" ...
double: NAs = TRUE, lag = 1, differences = 2, setNames = 0, useNames = 1
 Named num [1:8] NA 8.15 NA NA NA ...
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
 Named num [1:8] NA 8.15 NA NA NA ...
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
double: NAs = TRUE, lag = 1, differences = 3, setNames = 0, useNames = 1
 Named num [1:7] NA NA NA NA NA NA NA
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
 Named num [1:7] NA NA NA NA NA NA NA
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
double: NAs = TRUE, lag = 1, differences = 4, setNames = 0, useNames = 1
 Named num [1:6] NA NA NA NA NA NA
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
 Named num [1:6] NA NA NA NA NA NA
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
double: NAs = TRUE, lag = 2, differences = 1, setNames = 0, useNames = 1
 Named num [1:8] NA 9.5 NA NA NA ...
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
 Named num [1:8] NA 9.5 NA NA NA ...
 - attr(*, "names")= chr [1:8] "C" "D" "E" "F" ...
double: NAs = TRUE, lag = 2, differences = 2, setNames = 0, useNames = 1
 Named num [1:6] NA NA NA NA NA NA
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
 Named num [1:6] NA NA NA NA NA NA
 - attr(*, "names")= chr [1:6] "E" "F" "G" "H" ...
double: NAs = TRUE, lag = 2, differences = 3, setNames = 0, useNames = 1
 Named num [1:4] NA NA NA NA
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
 Named num [1:4] NA NA NA NA
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
double: NAs = TRUE, lag = 2, differences = 4, setNames = 0, useNames = 1
 Named num [1:2] NA NA
 - attr(*, "names")= chr [1:2] "I" "J"
 Named num [1:2] NA NA
 - attr(*, "names")= chr [1:2] "I" "J"
double: NAs = TRUE, lag = 3, differences = 1, setNames = 0, useNames = 1
 Named num [1:7] NA NA NA NA NA NA NA
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
 Named num [1:7] NA NA NA NA NA NA NA
 - attr(*, "names")= chr [1:7] "D" "E" "F" "G" ...
double: NAs = TRUE, lag = 3, differences = 2, setNames = 0, useNames = 1
 Named num [1:4] NA NA NA NA
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
 Named num [1:4] NA NA NA NA
 - attr(*, "names")= chr [1:4] "G" "H" "I" "J"
double: NAs = TRUE, lag = 3, differences = 3, setNames = 0, useNames = 1
 Named num NA
 - attr(*, "names")= chr "J"
 Named num NA
 - attr(*, "names")= chr "J"
double: NAs = TRUE, lag = 3, differences = 4, setNames = 0, useNames = 1
 Named num(0) 
 - attr(*, "names")= chr(0) 
 Named num(0) 
 - attr(*, "names")= chr(0) 
double: NAs = TRUE, lag = 1, differences = 1, setNames = 0, useNames = 0
 num [1:9] NA 0.673 8.826 NA NA ...
 num [1:9] NA 0.673 8.826 NA NA ...
double: NAs = TRUE, lag = 1, differences = 2, setNames = 0, useNames = 0
 num [1:8] NA 8.15 NA NA NA ...
 num [1:8] NA 8.15 NA NA NA ...
double: NAs = TRUE, lag = 1, differences = 3, setNames = 0, useNames = 0
 num [1:7] NA NA NA NA NA NA NA
 num [1:7] NA NA NA NA NA NA NA
double: NAs = TRUE, lag = 1, differences = 4, setNames = 0, useNames = 0
 num [1:6] NA NA NA NA NA NA
 num [1:6] NA NA NA NA NA NA
double: NAs = TRUE, lag = 2, differences = 1, setNames = 0, useNames = 0
 num [1:8] NA 9.5 NA NA NA ...
 num [1:8] NA 9.5 NA NA NA ...
double: NAs = TRUE, lag = 2, differences = 2, setNames = 0, useNames = 0
 num [1:6] NA NA NA NA NA NA
 num [1:6] NA NA NA NA NA NA
double: NAs = TRUE, lag = 2, differences = 3, setNames = 0, useNames = 0
 num [1:4] NA NA NA NA
 num [1:4] NA NA NA NA
double: NAs = TRUE, lag = 2, differences = 4, setNames = 0, useNames = 0
 num [1:2] NA NA
 num [1:2] NA NA
double: NAs = TRUE, lag = 3, differences = 1, setNames = 0, useNames = 0
 num [1:7] NA NA NA NA NA NA NA
 num [1:7] NA NA NA NA NA NA NA
double: NAs = TRUE, lag = 3, differences = 2, setNames = 0, useNames = 0
 num [1:4] NA NA NA NA
 num [1:4] NA NA NA NA
double: NAs = TRUE, lag = 3, differences = 3, setNames = 0, useNames = 0
 num NA
 num NA
double: NAs = TRUE, lag = 3, differences = 4, setNames = 0, useNames = 0
 num(0) 
 num(0) 
> 
> proc.time()
   user  system elapsed 
   0.31    0.04    0.36