对numpy中的where方法嵌套使用详解

#!/usr/bin/python
 
import numpy as np
 
data = np.random.randn(4,5)
data1 =np.where(data > 0,1,
np.where(data <0,-1,0))
print(\"datavalue:\")
print(data)
print(\"data1value:\")
print(data1)

In [3]: %runpython_exp04.py

data value:

[[-2.06262429 0.94548656 -0.29458562 0.82657 -1.08587439]
 [-0.67416161 0.77247191 0.60330603 0.73694198 -0.63761278]
 [ 0.24887356 -0.27086027 0.34312363 0.727303 0.72741593]
 [-0.48973095 -0.33185631 -1.23341695 0.13569267 2.06881178]]

data1 value:

[[-1 1 -1 1-1]
 [-1 1 1 1 -1]
 [ 1 -1 1 1 1]
 [-1 -1 -1 1 1]]