capture_longer_spec: capture longer spec

In nc: Named Capture to Data Tables

capture longer spec

Description

Create a spec data table for input to pivot_longer_spec.

Usage

capture_longer_spec(data, 
    ..., values_to = "value")

Arguments

data	Data table to reshape (actually the data are ignored, and only the column names are used).
...	Regex and conversion as described in capture_first_vec. This is processed by measure so if "column" is used as an argument name then there will be multiple output columns in the reshaped data (analogous to names_to=".value" in pivot_longer).
values_to	string to use for name of value column in output (only used if there is a single output column in the reshaped data).

Value

data table describing a reshape longer operation.

Author(s)

Toby Dylan Hocking

Examples

if("measure" %in% ls(asNamespace("data.table"))){
  (one.iris <- iris[1,])
  (single.spec <- nc::capture_longer_spec(iris, part=".*", "[.]", dim=".*", values_to="cm"))
  (multiple.spec <- nc::capture_longer_spec(iris, part=".*", "[.]", column=".*"))
  if(requireNamespace("tidyr")){
    tidyr::pivot_longer_spec(one.iris, single.spec)
    tidyr::pivot_longer_spec(one.iris, multiple.spec)
  }
}

nc documentation built on Sept. 1, 2023, 1:07 a.m.