如何使用Python获得一组点的中心
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How to get center of set of points using Python
提问by Dominik Szopa
I would like to get the center point(x,y) of a figure created by a set of points.
我想获得由一组点创建的图形的中心点（x，y）。
How do I do this?
我该怎么做呢？
采纳答案by Colin
If you mean centroid, you just get the average of all the points.
如果你的意思是质心，你只是得到所有点的平均值。
x = [p[0] for p in points]
y = [p[1] for p in points]
centroid = (sum(x) / len(points), sum(y) / len(points))
回答by Kabie
I assume that a point is a tuple like (x,y).
我假设一个点是一个像 (x,y) 这样的元组。
x,y=zip(*points)
center=(max(x)+min(x))/2., (max(y)+min(y))/2.
回答by meduz
If the set of points is a numpy array positionsof sizes N x 2, then the centroid is simply given by:
如果点集是positions大小为 N x 2的 numpy 数组，则质心简单地由下式给出：
centroid = positions.mean(axis=0)
It will directly give you the 2 coordinates a a numpy array.
它将直接为您提供 2 个坐标 aa numpy 数组。
In general, numpy arrays can be used for all these measures in a vectorized way, which is compact and veryquick compared to forloops.
通常，numpy 数组可以以矢量化方式用于所有这些度量，与循环相比，这种方式紧凑且非常快速for。
