mlr3misc: unnest – R documentation

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unnest

Unnest List 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

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}.")

mlr3misc

Helper Functions for 'mlr3'

v0.10.0

LGPL-3

Authors

Michel Lang [cre, aut] (<https://orcid.org/0000-0001-9754-0393>), Patrick Schratz [aut] (<https://orcid.org/0000-0003-0748-6624>)

Initial release