title: return all columns except one matrix
body: <p>Suppose we have matrix <strong>A</strong> like this:<br/></p>
  
  <pre><code>   10 5 8 6 2
  A=  9 3 5 4 1
     12 5 7 2 6
  </code></pre>
  
  <p>How can I choose a subset of <strong>A</strong> where there is no third column(for example)??<br/>
  like this:</p>
  
  <pre><code>    10 5 6 2
  B =  9 3 4 1
      12 5 2 6
  </code></pre>
  
  <p>I know I can say:</p>
  
  <pre><code>B = A(:,[1 2 4 5]);
  </code></pre>
  
  <p>but I need a better way</p>