Returns the permutation that sorts a list.
Ordering[list]
Ordering[list, n]
Ordering[list, - n]
Ordering[list, n, p]
Ordering[{30, 10, 20}]
→ {2, 3, 1}Ordering[{3, 1, 2}, 5]
→
Take::take: Cannot take positions 1 through 5 in {2, 3, 1}.
Ordering[{3, 1, 2}, 5]