擅长:python、mysql、java
<p>如果将操作顺序翻转过来,可以在一行中完成:</p>
<pre><code>B = ind[A[ind]==value]
print B
[1 5]
</code></pre>
<p>把它分解:</p>
<pre><code>#subselect first
print A[ind]
[1 2 2 3]
#create a mask for the indices
print A[ind]==value
[False True True False]
print ind
[ 0 1 5 10]
print ind[A[ind]==value]
[1 5]
</code></pre>