二维向量

有大小和方向的箭头

向量既有大小也有方向。\vec{v} = (3, 4) 意思是"向右3向上4"。

可以首尾相接加向量。点积告诉你两个向量的同向程度——垂直时为零。

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什么是向量？
向量既有大小也有方向。
怎么求大小？
|\vec{v}| = \sqrt{x^2 + y^2}。
向量加法？
分量相加：(a₁+b₁, a₂+b₂)。
点积？
\vec{a} \cdot \vec{b} = a_1 b_1 + a_2 b_2。等于0时垂直。
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