numpy中的求和:cumsum和sum
import numpy as np
a=np.random.randint(1,9,size=9).reshape((3,3))#随机生成3X3的矩阵
print(a)
print(a.sum(axis=0))#对每一行求和
print(a.cumsum(axis=0))#对每一行求累加和
打印结果
[[7 3 5]
[2 7 2]
[7 6 5]]
[16 16 12]
[[ 7 3 5]
[ 9 10 7]
[16 16 12]]
