alt←{           ⍝ Alternant.
    r c←⍴⍵      ⍝ matrix ⍵
    0=r:⍵⍵⌿,⍵   ⍝ zero-row case
    1≥c:⍺⍺⌿,⍵   ⍝ zero/one-column case
    M←~⍤1 0⍨⍳r  ⍝ minors
    ⍵[;⎕IO]⍺⍺.⍵⍵(∇⍤2)⍵[M;1↓⍳c]
}

code_colours

test script

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