矩陣運算

計算兩矩陣相加

範例: add([[1,2],[3,4]], [[1,1],[1,1]]) => [[2,3], [4,5]]

計算兩矩陣相減

範例: sub([[1,2],[3,4]], [[1,1],[1,1]]) => [[0,1], [2,3]]
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