Split a data table, with a log

Reports how many tables the rows were split into, and how many rows each of them holds.

Usage

# S3 method for class 'data.table'
split(x, f, drop = FALSE, ...)

Arguments

x

The data table to split.

f

The grouping factor, as in base::split(). data.table's own by= is the usual way to give it instead.

drop

Whether to drop unused levels, as in base::split().

...

All other arguments of data.table's split() method, i.e. by, sorted, keep.by and flatten.

Value

The list of data tables that data.table returns.

Examples

dt <- data.table::data.table(g = c("a", "a", "b"), v = 1:3)
split(dt, by = "g")
#> split: 3 rows into 2 tables (a: 2 rows, b: one row)
#> $a
#>         g     v
#>    <char> <int>
#> 1:      a     1
#> 2:      a     2
#> 
#> $b
#>         g     v
#>    <char> <int>
#> 1:      b     3
#>