title: Python : How to combine 4 small matrix become a large matrix
body: <pre><code>Mat_1 is 2x2 matrix   =
  [[1,2], 
  [3,4]]   
  
  Mat_2 is 2x2 matrix   =
  [[a,b],
  [c,d]] 
  
  Mat_3 is 2x2 matrix = 
  [[5,6], 
  [7,8]]    
  
  Mat_4 is 2x2 matrix  = 
  [[e,f], 
  [g,h]]   
  </code></pre>
  
  <p>How to combine the 4 matrix into one new matrix as below,  <br/></p>
  
  <pre><code>Mat is 4x4 matrix   = 
  [ [1,2,a,b],   
    [3,4,c,d],   
    [5,6,e,f],   
    [7,8,g,h]]  
  </code></pre>
  
  <p>Can solve by numpy.reshape or resize ?  <br/></p>