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Numpy finding the mean value of non-zero elements of matrix

2022-07-22 19:06:00 【yijun009】

If we have a matrix A, Want to require the mean value of non-zero elements , The way of calculation is ：
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Direct use mean If you ask , The denominator is the number of all elements , It doesn't meet our requirements .
stay matlab in , To do so ：

mean(AA(AA~=0))

numpy：

import numpy as np
a = np.array([[0,1],[0,0]])
exist = (a != 0)
mean_value = a.sum()/exist.sum()

Use this method first , Succinct not found .
Reference resources ：https://blog.csdn.net/iteapoy/article/details/85139485

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