R: Add columns to a data frame

add_column {tibble} | R Documentation

## Add columns to a data frame

### Description

This is a convenient way to add one or more columns to an existing data frame.

### Usage

    add_column(
      .data,
      ...,
      .before = NULL,
      .after = NULL,
      .name_repair = c("check_unique", "unique", "universal", "minimal")
    )

### Arguments

`.data` | Data frame to append to.
`...` | <`dynamic-dots`> Name-value pairs, passed on to `tibble()`. All values must have the same size of `.data` or size 1.
`.before, .after` | One-based column index or column name where to add the new columns, default: after last column.
`.name_repair` | Treatment of problematic column names: `"minimal"`: No name repair or checks, beyond basic existence, `"unique"`: Make sure names are unique and not empty, `"check_unique"`: (default value), no name repair, but check they are `unique`, `"universal"`: Make the names `unique` and syntactic a function: apply custom name repair (e.g., `.name_repair = make.names` for names in the style of base R). A purrr-style anonymous function, see `rlang::as_function()` This argument is passed on as `repair` to `vctrs::vec_as_names()`. See there for more details on these terms and the strategies used to enforce them.

### See Also

Other addition: `add_row()`

### Examples

    # add_column ---------------------------------
    df <- tibble(x = 1:3, y = 3:1)

    df %>% add_column(z = -1:1, w = 0)
    df %>% add_column(z = -1:1, .before = "y")

    # You can't overwrite existing columns
    try(df %>% add_column(x = 4:6))

    # You can't create new observations
    try(df %>% add_column(z = 1:5))

[Package tibble version 3.0.6 Index]