layout_to_blocks_data_table: Map a data records from row records to block records with one...

In rqdatatable: 'rquery' for 'data.table'

Map a data records from row records to block records with one record row per columnsToTakeFrom value.

Description

Map a data records from row records (records that are exactly single rows) to block records (records that may be more than one row). All columns not named in columnsToTakeFrom are copied to each record row in the result.

Usage

layout_to_blocks_data_table(
  data,
  ...,
  nameForNewKeyColumn,
  nameForNewValueColumn,
  columnsToTakeFrom,
  columnsToCopy = setdiff(colnames(data), columnsToTakeFrom)
)

Arguments

data	data.frame to work with.
...	force later arguments to bind by name.
nameForNewKeyColumn	character name of column to write new keys in.
nameForNewValueColumn	character name of column to write new values in.
columnsToTakeFrom	character array names of columns to take values from.
columnsToCopy	character array names of columns to copy.

Value

new data.frame with values moved to rows.

Examples

(d <- wrapr::build_frame(
  "id"  , "id2", "AUC", "R2" |
    1   , "a"  , 0.7  , 0.4  |
    2   , "b"  , 0.8  , 0.5  ))

(layout_to_blocks_data_table(
  d,
  nameForNewKeyColumn = "measure",
  nameForNewValueColumn = "value",
  columnsToTakeFrom = c("AUC", "R2"),
  columnsToCopy = c("id", "id2")))

rqdatatable documentation built on Aug. 21, 2023, 9:10 a.m.