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问题描述
我正在使用Python 3.6.
我真的很困惑，为什么会这样?
I am working with Python 3.6.
I am really confused, why this happened ?
In [1]: import numpy as np
In [2]: a = np.array(-1)
In [3]: a
Out[3]: array(-1)
In [4]: a ** (1/3)
/Users/wonderful/anaconda/bin/ipython:1: RuntimeWarning: invalid value encountered in power
#!/Users/wonderful/anaconda/bin/python
Out[4]: nan
推荐答案
Numpy似乎不允许负数的分数幂，即使该幂不会导致复数. (实际上，我今天早些时候也有同样的问题).一种解决方法是使用
Numpy does not seem to allow fractional powers of negative numbers, even if the power would not result in a complex number. (I actually had this same problem earlier today, unrelatedly). One workaround is to use
np.sign(a) * (np.abs(a)) ** (1 / 3)
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