例题2.30代码
import numpy as np
a = np.array([[0, 3, 4], [1, 6, 4]])
b = a.sum()
c1 = sum(a)
c2 = np.sum(a, axis = 0)
c3 = np.sum(a, axis = 1, keepdims = True)
print(c1)
print(c2.shape, c3.shape)
import numpy as np
a = np.array([[0, 3, 4], [1, 6, 4]])
b = a.sum()
c1 = sum(a)
c2 = np.sum(a, axis = 0)
c3 = np.sum(a, axis = 1, keepdims = True)
print(c2.shape, c3.shape)
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