This is a method for the tidyr tidyr::nest()
generic. It is translated
using the non-nested variables in the by
argument and .SD
in the j
argument.
Usage
# S3 method for class 'dtplyr_step'
nest(.data, ..., .names_sep = NULL, .key = deprecated())
Arguments
- .data
A data frame.
- ...
<
tidy-select
> Columns to nest, specified using name-variable pairs of the formnew_col = c(col1, col2, col3)
. The right hand side can be any valid tidy select expression.- .names_sep
If
NULL
, the default, the inner names will come from the former outer names. If a string, the new inner names will use the outer names withnames_sep
automatically stripped. This makesnames_sep
roughly symmetric between nesting and unnesting.- .key
Not supported.
- data
A
lazy_dt()
.
Examples
if (require("tidyr", quietly = TRUE)) {
dt <- lazy_dt(tibble(x = c(1, 2, 1), y = c("a", "a", "b")))
dt %>% nest(data = y)
dt %>% dplyr::group_by(x) %>% nest()
}
#> Source: local data table [2 x 2]
#> Groups: x
#> Call: `_DT24`[, .(data = .(.SD)), by = .(x)]
#>
#> x data
#> <dbl> <list>
#> 1 1 <dt [2 × 1]>
#> 2 2 <dt [1 × 1]>
#>
#> # Use as.data.table()/as.data.frame()/as_tibble() to access results