title: Filling empty Numpy array with numbers
body: <p>I have created a numpy array with (16,19) dimension. I would like to fill it with ones in the first row, 2 in the second row, 3 in the third row and so on until I reach the last row.
  I am very new in Python so that´s why I don´t probabably understand very well how it works. This is what I have tried until now:</p>
  
  <pre><code>arboles=np.zeros((16,19),dtype=np.int16)
  
  for i in arboles:
      count=0
      arboli = arboles[1,:] == 1
      arboles=count+1
  </code></pre>
  
  <p>I am probably missing some order in the middle where I ask Numpy to write the numbers in the empty array. Any help please?</p>