lvls | R Documentation |
lvls_reorder
leaves values as they are, but changes the order.
lvls_revalue
changes the values of existing levels; there must
be one new level for each old level.
lvls_expand
expands the set of levels; the new levels must
include the old levels.
lvls_reorder(f, idx, ordered = NA) lvls_revalue(f, new_levels) lvls_expand(f, new_levels)
f |
A factor (or character vector). |
idx |
A integer index, with one integer for each existing level. |
ordered |
A logical which determines the "ordered" status of the
output factor. |
new_levels |
A character vector of new levels. |
These functions are less helpful than the higher-level fct_
functions,
but are safer than the very low-level manipulation of levels directly,
because they are more specific, and hence can more carefully check their
arguments.
f <- factor(c("a", "b", "c")) lvls_reorder(f, 3:1) lvls_revalue(f, c("apple", "banana", "carrot")) lvls_expand(f, c("a", "b", "c", "d"))
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