title: Determinant equal to 0 matlab
body: <p>I'm learning how to use Matlab. I've a question about the matrix A:
  A=[1,2,3;4,5,6;7,8,9]
  Obviously the determinant should be equal to 0. But actually I got the value: 6.661338147750939e-016
  What is wrong?</p>
  
  <p>I know it's pretty much zero. What I want is to have zero as result. Is there a way to get 0 (precise result) or 6.661338147750939e-016 is all I can get?</p>