title: Convert a 3D array to 2D
body: <p>I got a numpy array with shape (1,3,300), I wanted to get rid of the first axis and get just the 3*300 2D array.  How can I do it ?</p>
  
  <p>I saw couple of questions like this <a href="https://stackoverflow.com/questions/32838802/numpy-with-python-convert-3d-array-to-2d">numpy with python: convert 3d array to 2d</a>
  where the requirements are more complex.  Mine seems pretty simple.  Any eacy way to do it ?</p>