title: Numpy array, insert alternate rows of zeros
body: <p>I am trying to modify a NumPy array by adding a row of zeros after each row. My matrix has 491 rows and I should end up with a matrix that has 982 rows. I tried multiple ways using <code>np.repeat</code>, <code>np.tile</code> and so on to no avail.</p>
  
  <p>Can anyone help me with this issue?</p>