* 2. The arrays have same number of tuples and one array, say _a2_, has one
* component. Then
* _a_ [ i, j ] = _a1_ [ i, j ] * _a2_ [ i, 0 ].
* 2. The arrays have same number of tuples and one array, say _a2_, has one
* component. Then
* _a_ [ i, j ] = _a1_ [ i, j ] * _a2_ [ i, 0 ].