線形代数 例

Two matrices can be multiplied if and only if the number of columns in the first matrix is equal to the number of rows in the second matrix. In this case, the first matrix is ${\displaystyle 2\times 2}$ and the second matrix is ${\displaystyle 2\times 1}$.

1番目の行列の各行と2番目の行列の各列を掛けます。