Examples ⎕←data←?3 4⍴10 1 7 4 5 2 0 6 6 9 3 5 8 +/R 1 +data 17 14 25 +/[1] data 17 14 25 ⍋R 1 +data 0 2 3 1 1 0 2 3 1 2 3 0 ⍋[1] data SYNTAX ERROR ⍋[1]data ∧ gradea←{c←¯1↑⍴⍵ ⋄ j←c/c×⍳×/¯1↓⍴⍵ ⋄ (⍴⍵)⍴j-⍨⍋j,[0.5],⍵} gradea data 0 2 3 1 1 0 2 3 1 2 3 0 gradeb←{↑ ⍋¨ ⊂[¯1+⍴⍴⍵] ⍵} gradeb data 0 2 3 1 1 0 2 3 1 2 3 0 {⍵[⍋⍵]}R 1 +data 1 4 5 7 0 2 6 6 3 5 8 9 {⍵[⍋⍵]}[1] data SYNTAX ERROR {⍵[⍋⍵]}[1]data ∧ avg←{(+⌿⍵)÷⊃(⍴⍵),1} avg R 1 +data 4.25 3.5 6.25 avg[1] data SYNTAX ERROR avg[1]data ∧ avg R 2 +data 4 3.33333 5 6.33333 avg R 0 +data 1 7 4 5 2 0 6 6 9 3 5 8 |