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. |

f <- factor(sample(letters[1:3], 20, replace = TRUE)) f#> [1] a a a a a a a b c c b b a b a c a c a b #> Levels: a b cfct_expand(f, "d", "e", "f")#> [1] a a a a a a a b c c b b a b a c a c a b #> Levels: a b c d e ffct_expand(f, letters[1:6])#> [1] a a a a a a a b c c b b a b a c a c a b #> Levels: a b c d e f