Add additional levels to a factor

fct_expand(f, ...)

f | A factor (or character vector). |
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... | Additional levels to add to the factor. Levels that already exist will be silently ignored. |

`fct_drop()`

to drop unused factor levels.

#> [1] c a a c b b a b c b b a c a b c b c c c #> Levels: a b cfct_expand(f, "d", "e", "f")#> [1] c a a c b b a b c b b a c a b c b c c c #> Levels: a b c d e ffct_expand(f, letters[1:6])#> [1] c a a c b b a b c b b a c a b c b c c c #> Levels: a b c d e f