title: Accessing rows of an array, inside an array of arrays?
body: <p>Say i have:</p>
  
  <pre><code>H = [array(a), array(b), array(c)...]
  
  a = [[1,2,3,4,5,6],
       [11,22,33,44,55,66], #row 1 of H[0]
       [111,222,333,444,555,666]]
  b = [[7,8,9,0,1,2],
       [77,88,99,00,11,22],
       [777,888,999,000,111,222]]
  c = ...
  </code></pre>
  
  <p>I want to access row 1 of H[0], but then move onto accessing the rows within H[1] and so on.</p>
  
  <p>My question(s):</p>
  
  <p>1) How do i call on row 1 of H[0]? </p>
  
  <p>2) How do i then, after going through all rows in H[0], make a loop run to H[1]?</p>
  
  <p>I know i need something like</p>
  
  <pre><code>for i in range(len(H)):
      do stuff to rows until the last row in H[i]
      move onto H[i+1]
      do same stuff
      stop when (criteria here reached)
  </code></pre>
  
  <p>All help is appreciated. Thank you.</p>
  
  <p><strong>Edit: I now know I can access this by <code>H[0][1]</code> but i actually need the 0th column values within each row of the arrays. So, i need <code>11</code> from <code>H[0][1]</code>. How do i do this?</strong></p>