我能想到的最简单的方法是:只需找到按每个分量的贡献加权的质量分量坐标的平均值。
import numpy
masses = numpy.array([[0, 0, 0, 0],
[0, 1, 0, 0],
[0, 2, 0, 0],
[1, 0, 0, 0],
[1, 1, 0, 1],
[1, 2, 0, 1],
[2, 0, 0, 0],
[2, 1, 0, 0],
[2, 2, 0, 0]])
nonZeroMasses = masses[numpy.nonzero(masses[:,3])] # Not really necessary, can just use masses because 0 mass used as weight will work just fine.
CM = numpy.average(nonZeroMasses[:,:3], axis=0, weights=nonZeroMasses[:,3])