使用2个条件在Python中过滤数组

Question

如何根据两个条件过滤数组A？

A = array([1, 2.3, 4.3, 10, 23, 42, 23, 12, 1, 1])
B = array([1, 7, 21, 5, 9, 12, 14, 22, 12, 0])
print A[(B < 13)]      # here we get all items A[i] with i such that B[i] < 13
print A[(B > 5) and (B < 13)]   # here it doesn't work
                                # how to get all items A[i] such that B[i] < 13 
                                # AND B[i] > 5 ?

错误是：

  

ValueError：具有多个元素的数组的真值   不明确的。

Answer 1

>>> A[np.logical_and(B > 5, B < 13)]
array([  2.3,  23. ,  42. ,   1. ])

Answer 2

您应该使用and的运算符&的按位（感谢@askewchan）版本。

即

 print A[(B > 5) & (B < 13)]