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付録A行列演算の基礎

ここでは、本書の中に出てくる計算を追う上で必要最低限の行列関連の演算をまとめます。

A.1　行列の定義

行列（matrix）とは数字を縦横に並べたものです。たとえば、あるm \times n行列Aは以下のように表されます。

A = \begin{pmatrix} a_{1, 1} & \cdots & a_{1, n} \\ \vdots & \ddots & \vdots \\ a_{m, 1} & \cdots & a_{m, n} \end{pmatrix}

m \times n行列は、縦にm個の、横にn個の数を配置します。横に並ぶ数の筋を行、縦に並ぶ数の筋を ...

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