title: Find all zero(s) in matrix in matlab
body: <p>Please help me I want to find all zero elements in matrix in MATLAB.
  For example, if matrix </p>
  
  <pre><code>A = [1 3 0; 2 4 9; 2 0 7] 
  </code></pre>
  
  <p>the answer should be <code>(1,3)</code> and <code>(3,2)</code>.<br>
  But the real matrix I want to solve is very big. Is there any way to do this.</p>