title: Colon operator in MATLAB for defining a sequence vector
body: <p>I have always used colon operator in MATLAB to create a vector in the following way:</p>
  
  <pre><code>j:i:k =&gt; [j, j + i, j + 2i, ..., j + m * i]
  </code></pre>
  
  <p>but now I need to creat a vector like that:</p>
  
  <pre><code>[i, 2i, 4i, 8i, 16i, ... etc]
  </code></pre>
  
  <p>How can I do this using the colon operator?</p>