title: Matrix `sum` in MATLAB giving counterintuitive answer
body: <p>I am getting the following answer in MATLAB as solution of a linear system of equations</p>
  
  <p><code>ans =
     1.0e+05 *
     2.1736 + 0.0000i
    -1.0868 - 2.1408i
    -1.0868 + 2.1408i
  </code></p>
  
  <p>when i do <code>sum(ans)</code> it gives <code>1</code> as the answer but when i physically add  them it turns to be <code>0</code></p>
  
  <p>What am i doing wrong? Cannot figure out at all</p>