Nothing
Code
sparse_dummy(letters)
Condition
Error in `sparse_dummy()`:
! `x` must be a factor, not a character vector.
Code
sparse_dummy(mtcars)
Condition
Error in `sparse_dummy()`:
! `x` must be a factor, not a data frame.
Code
sparse_dummy(1:5)
Condition
Error in `sparse_dummy()`:
! `x` must be a factor, not an integer vector.
Code
sparse_dummy(NULL)
Condition
Error in `sparse_dummy()`:
! `x` must be a factor, not NULL.
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