title: Index and complementary index, in a Matlab array
body: <p>Here I have an array and extract some elements according to a conditional statement;</p>
  
  <pre><code>A = 10:-1:1;
  idx = find(A&gt;3);
  </code></pre>
  
  <p>What is the direct way to get the rest of elements, which are here 1, 2 and 3, but using returned idx ?</p>