点与线之间的距离(从两个点开始) [英] Distance between point and a line (from two points)

问题描述

我正在使用Python + Numpy(也可以使用Scipy)并具有三个2D点

I'm using Python+Numpy (can maybe also use Scipy) and have three 2D points

(P1, P2, P3); 

我试图使从P3到与P1和P2之间绘制的线垂直的距离.让P1=(x1,y1)，P2=(x2,y2)和P3=(x3,y3)

I am trying to get the distance from P3 perpendicular to a line drawn between P1 and P2. Let P1=(x1,y1), P2=(x2,y2) and P3=(x3,y3)

使用矢量符号很容易，但是我对python/numpy还是很陌生，无法获得任何有效的方法(甚至关闭).

In vector notation this would be pretty easy, but I'm fairly new to python/numpy and can't get anythng that works (or even close).

感谢任何提示，谢谢！

推荐答案

尝试使用numpy.linalg

d = norm(np.cross(p2-p1, p1-p3))/norm(p2-p1)

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