擅长:python、mysql、java
<p>尝试使用<a href="http://docs.scipy.org/doc/numpy/reference/generated/numpy.ma.MaskedArray.choose.html#numpy.ma.MaskedArray.choose" rel="nofollow">choose</a>方法,如下所示:</p>
<pre><code>np.ma.array(np.arange(20).reshape(4, 5), mask=np.arange(20).reshape(4, 5) % 3).
choose(np.ma.arange(10, 60, 2))
</code></pre>
<p>它给出了:</p>
^{pr2}$