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. |
... |
Character vector of levels. Any levels not mentioned will be left in existing order, after the explicitly mentioned levels. |
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")