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Models Row by Column
dotc ← {↑ (↓⍺) ∘.(⍺⍺{⍺⍺/⍺ ⍵⍵ ⍵}⍵⍵) ↓(¯1⌽⍳⍴⍴⍵)⍉⍵} dotc1 ← {↑ (↓⍺) ∘.(⍺⍺{⍺⍺/⍺ ⍵⍵ ⍵}⍵⍵) ↓flip ⍵} flip ← {(¯1⌽⍳⍴⍴⍵)⍉⍵}