droplevels2 | R Documentation |
Drop factor levels preserving the range, i.e., unused levels between
min_level
and max_level
will not be dropped.
droplevels2(
x,
min_level = min(as.integer(x), na.rm = TRUE),
max_level = max(as.integer(x), na.rm = TRUE)
)
x |
a factor variable |
min_level , max_level |
min and max unused factor levels to include |
droplevels
x <- factor(c('b', 'd'), levels = letters[1:5])
droplevels(x)
## levels between used levels are kept
droplevels2(x)
## keep first level thru last level used
droplevels2(x, min_level = 1)
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