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一次元ベクトルの回転行列 2

一次元ベクトルを二次元平面に置いてみます。原点からx軸に沿って置きましょう。すると、rを実数として、長さrのベクトルは(r,0)ですね。たまたま平面に置いてあるだけで、これの実態は一次元ベクトルだと思ってください。さてこれを回転させます。平面ベクトルの回転行列は(cosθ -sinθ)(sinθ cosθ)です。θはπか2πでしたね。sinπ、sin2πは0なので、じつのところ下の行列にな...

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