mlr3misc (version 0.5.0)

unnest: Unnest List Data Table Columns

Description

Transforms list columns to separate columns, possibly by reference. The original columns are removed from the returned table. All non-atomic objects in the list columns are expand to new list column.

Usage

unnest(x, cols, prefix = NULL)

Arguments

x

(data.table::data.table()) data.table::data.table() with columns to unnest.

cols

(character()) Column names of list columns to operate on.

prefix

(logical(1) | character(1)) String to prefix the new column names with. Use "{col}" (without the quotes) as placeholder for the original column name.

Value

(data.table::data.table()).

Examples

# NOT RUN {
x = data.table::data.table(
  id = 1:2,
  value = list(list(a = 1, b = 2), list(a = 2, b = 2))
)
print(x)
unnest(data.table::copy(x), "value")
unnest(data.table::copy(x), "value", prefix = "{col}.")
# }