title: Extracting one row from a numpy matrix
body: <p>I currently testing a NN implementation, in which the train data is stored in numpy matrix. </p>
  
  <pre><code>print train_set_data_vstacked_normalized.shape
  
  (219970,400)
  </code></pre>
  
  <p>The input data currently looks like this, i have to feed each row to my neural network .. </p>
  
  <p>It takes in input of shape (none,400).</p>
  
  <p>How do i take one row out, such that the array i take out of the matrix has 400 entries, or 400 columns and one row?</p>
  
  <p>I've tried </p>
  
  <pre><code>print train_set_data_vstacked_normalized[:,0].shape
  (219970,)
  
  print train_set_data_vstacked_normalized[0,:].shape
  (400,)
  </code></pre>