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Originally Posted by GUILLE what are horizontal vectors equivalent to in matrices? |
Row vectors are 1 by n row matrices. When you multiply a row vector and a column vector the product is a 1 by 1 matrix or a scalar with just one element. However, if you switch the order such that the column vector is on the left, in this case the multiplication is not defined, therefore not commutative. Multiplications of square matrices are always commutative.