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Y may be any array of rank greater than 0 but may not contain namespaces. R is an integer vector being the permutation of ⍳1↑⍴Y that places the sub-arrays along the first axis in descending order. For the rules for comparing items of Y with one another, see Grade Up (Monadic).

⎕IO is an implicit argument of Grade Down.

Examples

      ⍒22.5 1 15 3 ¯4
1 3 4 2 5

      M
2 3 5
1 4 7
     
2 3 4
5 2 4
     
2 3 5
1 2 6
      ⍒M
1 3 2

Note that character arrays sort differently in the Unicode and Classic Editions.

      M
Goldilocks
porridge   
Porridge   
3 bears 

      ⍒M
2 3 1 4

      ⍒M
3 1 4 2

      M[⍒M;]
porridge
Porridge
Goldilocks
3 bears

      M[⍒M;]
Porridge
Goldilocks
3 bears
porridge

      ⍴pb
6 3
      pb
┌────────┬─────┬───┐
│Rivers  │Jason│554│
├────────┼─────┼───┤
│Daintree│John │532│
├────────┼─────┼───┤
│Rivers  │Jason│543│
├────────┼─────┼───┤
│Foad    │Jay  │558│
├────────┼─────┼───┤
│Scholes │John │547│
├────────┼─────┼───┤
│Scholes │John │535│
└────────┴─────┴───┘
      ⍒pb
5 6 1 3 4 2