| stretch2 {tsibble} | R Documentation |
Fixing an initial window and expanding more observations:
stretch2() and pstretch() always returns a list.
stretch2_lgl(), stretch2_int(), stretch2_dbl(), stretch2_chr() use the same
arguments as stretch2(), but return vectors of the corresponding type.
stretch2_dfr() stretch2_dfc() return data frames using row-binding & column-binding.
stretch2(.x, .y, .f, ..., .size = 1, .init = 1, .bind = FALSE) stretch2_dfr(.x, .y, .f, ..., .size = 1, .init = 1, .bind = FALSE, .id = NULL) stretch2_dfc(.x, .y, .f, ..., .size = 1, .init = 1, .bind = FALSE) pstretch(.l, .f, ..., .size = 1, .init = 1, .bind = FALSE) pstretch_dfr(.l, .f, ..., .size = 1, .init = 1, .bind = FALSE, .id = NULL) pstretch_dfc(.l, .f, ..., .size = 1, .init = 1, .bind = FALSE)
.x |
Objects to slide over simultaneously. |
.y |
Objects to slide over simultaneously. |
.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, .init |
An integer for moving and initial window size. |
.bind |
If |
.id |
If not |
.l |
A list of lists. The length of |
slide2 for sliding window with overlapping observations
tile2 for tiling window without overlapping observations
Other stretching window functions: stretch
x <- 1:5
y <- 6:10
z <- 11:15
lst <- list(x = x, y = y, z = z)
df <- as.data.frame(lst)
stretch2(x, y, sum, .size = 2)
stretch2(lst, lst, ~ ., .size = 2)
stretch2(df, df, ~ ., .size = 2)
pstretch(lst, sum, .size = 1)
pstretch(list(lst, lst), ~ ., .size = 2)
###
# row-wise stretching over data frame
###
x <- as.Date("2017-01-01") + 0:364
df <- data.frame(x = x, y = seq_along(x))
tibble(
data = pstretch(df, function(...) as_tibble(list(...)), .init = 10)
)