step-subset-slice.md
In dtplyr: Data Table Back-End for 'dplyr'

slice_*() checks for empty ...

Code
  slice_head(dt, 5)
Condition
  Error in `slice_head()`:
  ! `n` must be explicitly named.
  i Did you mean `slice_head(n = 5)`?
Code
  slice_tail(dt, 5)
Condition
  Error in `slice_tail()`:
  ! `n` must be explicitly named.
  i Did you mean `slice_tail(n = 5)`?
Code
  slice_min(dt, x, 5)
Condition
  Error in `slice_min()`:
  ! `n` must be explicitly named.
  i Did you mean `slice_min(n = 5)`?
Code
  slice_max(dt, x, 5)
Condition
  Error in `slice_max()`:
  ! `n` must be explicitly named.
  i Did you mean `slice_max(n = 5)`?
Code
  slice_sample(dt, 5)
Condition
  Error in `slice_sample()`:
  ! `n` must be explicitly named.
  i Did you mean `slice_sample(n = 5)`?

Code
  slice_min(dt)
Condition
  Error in `slice_min()`:
  ! `order_by` is absent but must be supplied.
Code
  slice_max(dt)
Condition
  Error in `slice_max()`:
  ! `order_by` is absent but must be supplied.

check_slice_catches common errors

Code
  slice_head(dt, n = 1, prop = 1)
Condition
  Error in `slice_head()`:
  ! Must supply exactly one of `n` and `prop` arguments.
Code
  slice_head(dt, n = "a")
Condition
  Error in `slice_head()`:
  ! `n` must be a single number.
Code
  slice_head(dt, prop = "a")
Condition
  Error in `slice_head()`:
  ! `prop` must be a single number.
Code
  slice_head(dt, n = NA)
Condition
  Error in `slice_head()`:
  ! `n` must be a single number.
Code
  slice_head(dt, prop = NA)
Condition
  Error in `slice_head()`:
  ! `prop` must be a single number.