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Models — Row by Column


   dotc ←{↑ (↓⍺) ∘.(⍺⍺{⍺⍺/⍺ ⍵⍵ ⍵}⍵⍵) ↓(¯1⌽⍳⍴⍴⍵)⍉⍵}

   x←¯500+?13 19 11⍴1000
   y←¯500+?11 23⍴1000

   (x+.×y) ≡ x +dotc× y
1
   (x-.≥y) ≡ x -dotc≥ y
1