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().