R tibble add_column 將列添加到 DataFrame

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

其他補充：add_row()

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

df %>% add_column(z = -1:1, w = 0)
#> # A tibble: 3 × 4
#>       x     y     z     w
#>   <int> <int> <int> <dbl>
#> 1     1     3    -1     0
#> 2     2     2     0     0
#> 3     3     1     1     0
df %>% add_column(z = -1:1, .before = "y")
#> # A tibble: 3 × 3
#>       x     z     y
#>   <int> <int> <int>
#> 1     1    -1     3
#> 2     2     0     2
#> 3     3     1     1

# You can't overwrite existing columns
try(df %>% add_column(x = 4:6))
#> Error in add_column(., x = 4:6) : 
#>   Column name `x` must not be duplicated.
#> Use `.name_repair` to specify repair.
#> Caused by error in `repaired_names()` at tibble/R/names.R:14:2:
#> ! Names must be unique.
#> ✖ These names are duplicated:
#>   * "x" at locations 1 and 3.

# You can't create new observations
try(df %>% add_column(z = 1:5))
#> Error in add_column(., z = 1:5) : 
#>   New columns must be compatible with `.data`.
#> ✖ New column has 5 rows.
#> ℹ `.data` has 3 rows.