title: Confusion matrix in matlab
body: <p>I need to understand this piece of information, and im confused on this.    </p>
  
  <pre><code>    a  b  c  &lt;-- classified as
      11 1  1  | a = 1
      2  11 0  | b = 2
      0  0  13 | c = 3
  </code></pre>