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partial_factor
Partially specify a factor
Description
![[Experimental]](../help/figures/lifecycle-experimental.svg)
This special class can be passed as a ptype in order to specify that the
result should be a factor that contains at least the specified levels.
Usage
partial_factor(levels = character())
Arguments
levels |
Character vector of labels. |
Examples
# Assert that `x` is a factor
vec_assert(factor("x"), partial_factor())
# Testing with `factor()` is too strict,
# because it tries to match the levels exactly
# rather than learning them from the data.
try(vec_assert(factor("x"), factor()))
# You can also enforce a minimum set of levels
try(vec_assert(factor("x"), partial_factor("y")))
vec_assert(factor(c("x", "y")), partial_factor("y"))
pf <- partial_factor(levels = c("x", "y"))
pf
vec_ptype_common(factor("v"), factor("w"), .ptype = pf)