next up previous
Next: この文書について...

例題 次の行列の積ABを求めよ．

$\displaystyle A = \left(\begin{array}{rrr} 3&1&7\\ 5&2&-4 \end{array}\right), \ \ \ B = \left(\begin{array}{rr} 2&-3\\ 3&6\\ 4&1 \end{array}\right ) $

解答 行列の積は対応する行と列の内積． $AB = \left(\begin{array}{rr} 2&-3\\ 4&2 \end{array}\right)\left(\begin{array}{... ...end{array}\right) = \left(\begin{array}{cc} -11&4\\ 2&8 \end{array}\right ) . $