| stretch {tsibble} | R Documentation |
Fixing an initial window and expanding more observations:
stretch() always returns a list.
stretch_lgl(), stretch_int(), stretch_dbl(), stretch_chr() use the same
arguments as stretch(), but return vectors of the corresponding type.
stretch_dfr() stretch_dfc() return data frames using row-binding & column-binding.
stretch(.x, .f, ..., .size = 1, .init = 1, .bind = FALSE) stretch_dfr(.x, .f, ..., .size = 1, .init = 1, .bind = FALSE, .id = NULL) stretch_dfc(.x, .f, ..., .size = 1, .init = 1, .bind = FALSE)
.x |
An object to slide over. |
.f |
A function, formula, or atomic vector. If a function, it is used as is. If a formula, e.g.
This syntax allows you to create very compact anonymous functions. If character vector, numeric vector, or list, it
is converted to an extractor function. Character vectors index by name
and numeric vectors index by position; use a list to index by position
and name at different levels. Within a list, wrap strings in |
... |
Additional arguments passed on to |
.size |
An integer for window size. If positive, moving forward from left to right; if negative, moving backward (from right to left). |
.init |
A positive integer for an initial window size. |
.bind |
If |
.id |
If not |
future_stretch for stretching window in parallel
slide for sliding window with overlapping observations
tile for tiling window without overlapping observations
Other stretching window functions: stretch2
x <- 1:5 lst <- list(x = x, y = 6:10, z = 11:15) stretch_dbl(x, mean, .size = 2) stretch_lgl(x, ~ mean(.) > 2, .size = 2) stretch(lst, ~ ., .size = 2)