Nest

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 form new_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 with names_sep automatically stripped. This makes names_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