擅长:python、mysql、java
<p><code>np.arccos()</code>函数只能接受介于<code>-1</code>和<code>1</code>之间的值(包括)。</p>
<p>见:<a href="https://docs.scipy.org/doc/numpy-1.13.0/reference/generated/numpy.arccos.html" rel="nofollow noreferrer">https://docs.scipy.org/doc/numpy-1.13.0/reference/generated/numpy.arccos.html</a></p>