如何在给定条件下选择数组的元素? [英] How do I select elements of an array given condition?

问题描述

假设我有一个 numpy 数组 x = [5, 2, 3, 1, 4, 5], y = ['f', 'o', 'o','b', 'a', 'r'].我想选择y中x中大于1小于5的元素对应的元素.

我试过了

x = 数组([5, 2, 3, 1, 4, 5])y = 数组(['f','o','o','b','a','r'])输出 = y[x >1 &×＜5] # 期望的输出是 ['o','o','a']

但这不起作用.我该怎么做?

解决方案

如果您添加括号，您的表达式将起作用:

<预><代码>>>>y[(1 < x) &(x <5)]数组(['o', 'o', 'a'],dtype='|S1')

Suppose I have a numpy array x = [5, 2, 3, 1, 4, 5], y = ['f', 'o', 'o', 'b', 'a', 'r']. I want to select the elements in y corresponding to elements in x that are greater than 1 and less than 5.

I tried

x = array([5, 2, 3, 1, 4, 5])
y = array(['f','o','o','b','a','r'])
output = y[x > 1 & x < 5] # desired output is ['o','o','a']

but this doesn't work. How would I do this?

解决方案

Your expression works if you add parentheses:

>>> y[(1 < x) & (x < 5)]
array(['o', 'o', 'a'], 
      dtype='|S1')

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