numpy.mean()的几种用法

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import numpy as np
x = np.array([1,2,3,4,5])
y = np.array([0,2,3,4,6])
z = np.array([[1,2],[3,4]])#二维数组
np.mean(x==y)#返回条件成立的占比
Out[5]: 0.59999999999999998
np.mean(x)#均值
Out[6]: 3.0

np.mean(z)
Out[10]: 2.5
np.mean(z,axis=0)#按列求均值
Out[11]: array([ 2.,  3.])
np.mean(z,axis=1)#按行求均值
Out[12]: array([ 1.5,  3.5])