How to get the indices list of all NaN value in numpy array? : <p>Say now I have a numpy array which is defined as,</p>

<pre><code>[[1,2,3,4],
[2,3,NaN,5],
[NaN,5,2,3]]
</code></pre>

<p>Now I want to have a list that contains all the indices of the missing values, which is <code>[(1,2),(2,0)]</code> at this case.</p>

<p>Is there any way I can do that?</p>
