如何得到向量的大小

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向量"v"的大小就是它的长度,一般用|v|(在向量符号外加绝对值符号)来表征。本文将举例教给你如何计算一个向量的大小。你还可以学习有关向量的其它操作和计算,如计算向量的相加或相减,找到两个向量之间的角度以及计算两向量相交的焦点。

  1. How.com.vn 中文: Step 1 用数字表示向量。
    每一个向量都可以用v = <x, y>的形式表示,比如 v = <3, -5>。你可以通过这样的表示方法来计算向量大小。
  2. How.com.vn 中文: Step 2 使用公式。
    计算向量大小的公式是 |v| = sqrt(x2 + y2)。把向量的x和y值代入公式计算即可。
    • 比如: |v| = sqrt(32 + -52) = sqrt (9 + 25) = sqrt(36) = 6.
    • 不要为你的结果不是整数而担心,因为向量大小是可以出现小数位的。
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