list_c {purrr}

Combine list elements into a single data structure

Description

• list_c() combines elements into a vector by concatenating them together with vctrs::vec_c().

• list_rbind() combines elements into a data frame by row-binding them together with vctrs::vec_rbind().

• list_cbind() combines elements into a data frame by column-binding them together with vctrs::vec_cbind().

Usage

list_c(x, ..., ptype = NULL)

list_cbind(
  x,
  ...,
  name_repair = c("unique", "universal", "check_unique"),
  size = NULL
)

list_rbind(x, ..., names_to = rlang::zap(), ptype = NULL)

Arguments

x

A list. For list_rbind() and list_cbind() the list must only contain only data frames or NULL.

...

These dots are for future extensions and must be empty.

ptype

An optional prototype to ensure that the output type is always the same.

name_repair

One of "unique", "universal", or "check_unique". See vctrs::vec_as_names() for the meaning of these options.

size

An optional integer size to ensure that every input has the same size (i.e. number of rows).

names_to

By default, names(x) are lost. To keep them, supply a string to names_to and the names will be saved into a column with that name. If names_to is supplied and x is not named, the position of the elements will be used instead of the names.

Examples

x1 <- list(a = 1, b = 2, c = 3)
list_c(x1)

x2 <- list(
  a = data.frame(x = 1:2),
  b = data.frame(y = "a")
)
list_rbind(x2)
list_rbind(x2, names_to = "id")
list_rbind(unname(x2), names_to = "id")

list_cbind(x2)