/⍨ by itself seems to work: (2|⍳3) / ⍳3 1 3 (⍳3) /⍨ 2|⍳3 1 3
But inside a lambda I get a syntax error: {(2|⍵) / ⍵} ⍳3 1 3 {⍵ /⍨ 2|⍵} ⍳3 SYNTAX ERROR λ1[1] λ←⍵/⍨2∣⍵ ^ ^ Tobia
/⍨ by itself seems to work: (2|⍳3) / ⍳3 1 3 (⍳3) /⍨ 2|⍳3 1 3
But inside a lambda I get a syntax error: {(2|⍵) / ⍵} ⍳3 1 3 {⍵ /⍨ 2|⍵} ⍳3 SYNTAX ERROR λ1[1] λ←⍵/⍨2∣⍵ ^ ^ Tobia