title: What is the best way to pad a numpy array and graph it?
body: <p>I have an numpy array that is 20 values long. <code>y2020['no._of_cases'].shape = 20</code><br>
  I want to make it to be 52 values long, so that i can chart it with some blanks space behind.</p>
  
  <p>I tried padding it with np.nan but it returns a large negative number which messes up the chart.
  I tried padding it with blanks spaces but that will cause tracebacks when charting. </p>
  
  <pre><code> np.pad(y2020['no._of_cases'], (0,32),'constant', constant_values='np.nan')
  </code></pre>
  
  <p>Any pygod have any ideas?</p>