title: how to reverse/inverse order of elements in a vector or a matrix in matlab?
body: <p>I have a vector</p>
  
  <pre><code>a = 1:4
  </code></pre>
  
  <p>I want to get </p>
  
  <pre><code>[4 3 2 1]
  </code></pre>
  
  <p>Which matlab function should I use?</p>