`seq_row()`

creates a sequence along the number of rows of `x`

,
`seq_col()`

a sequence along the number of columns of `x`

.
`seq_len0()`

and `seq_along0()`

are the 0-based counterparts to `base::seq_len()`

and
`base::seq_along()`

.

`seq_row()`

creates a sequence along the number of rows of `x`

,
`seq_col()`

a sequence along the number of columns of `x`

.
`seq_len0()`

and `seq_along0()`

are the 0-based counterparts to `base::seq_len()`

and
`base::seq_along()`

.