向量方向 [英] Direction of a vector

问题描述

如果我有:

a=magic(9);

如何计算a中任意两个点之间的矢量方向和大小?例如，如果我定义vec = [a(1,1) a(2,2)]，矢量的方向是否会定义为:vecdir = a(1,1) - a(2,2)?

How do I compute the direction and magnitude of vectors between any two points in a? For example if I define vec = [a(1,1) a(2,2)], would the direction of the vector be defined as: vecdir = a(1,1) - a(2,2)?

推荐答案

vec = [x y]
dist = sqrt(sum(vec.^2)) % i.e. sqrt(x^2 + y^2)
dir = atan(y/x) % i.e. atan(vec(2) / vec(1))

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