Vector of input lagged along integer vector
lag_run(x, lag = 1L, idx = integer(0), nearest = FALSE)(vector, data.frame, matrix, xts, grouped_df)
input data.
(integer or character)
Window shift. Positive shifts back, negative shifts forward. Single value
or vector of length(x). Accepts time-interval strings when idx is set.
(integer, Date, POSIXt)
Sorted index of observations. When set, k and lag refer to index
distance rather than element count. Must be same length as x.
logical single value. Applied when idx is used,
then nearest = FALSE returns observation lagged exactly by the
specified number of "periods". When nearest = TRUE
function returns latest observation within lag window.
lag_run(1:10, lag = 3)
#> [1] NA NA NA 1 2 3 4 5 6 7
lag_run(letters[1:10], lag = -2, idx = c(1, 1, 1, 2, 3, 4, 6, 7, 8, 10))
#> [1] "e" "e" "e" "f" NA "g" "i" NA "j" NA
lag_run(letters[1:10], lag = 2, idx = c(1, 1, 1, 2, 3, 4, 6, 7, 8, 10), nearest = TRUE)
#> [1] NA "a" "a" "a" "a" "d" "f" "g" "g" "i"