| fct_relevel {forcats} | R Documentation |
This is a generalisaton of stats::relevel() that allows you to move any
number of levels to any location.
fct_relevel(.f, ..., after = 0L)
.f |
A factor (or character vector). |
... |
Character vector of levels. Any levels not mentioned will be left in existing order, after the explicitly mentioned levels. Supports tidy dots. |
after |
Where should the new values be placed? |
f <- factor(c("a", "b", "c", "d"))
fct_relevel(f)
fct_relevel(f, "c")
fct_relevel(f, "b", "a")
# Move to the third position
fct_relevel(f, "a", after = 2)
# Relevel to the end
fct_relevel(f, "a", after = Inf)
fct_relevel(f, "a", after = 3)
# Using 'Inf' allows you to relevel to the end when the number
# of levels is unknown or variable (e.g. vectorised operations)
df <- forcats::gss_cat[, c("rincome", "denom")]
lapply(df, levels)
df2 <- lapply(df, fct_relevel, "Don't know", after = Inf)
lapply(df2, levels)
# You'll get a warning if the levels don't exist
fct_relevel(f, "e")