title: Reduce Whitespace in pcolor matplotlib plot
body: <p>I'm currently working on plotting pivoted tables using matplotlib pcolor but my axes are not functioning like i would like them to.
  I plot the tables using:</p>
  
  <pre><code>pyl.pcolor(pivot_99)
  pyl.colorbar()
  pyp.suptitle('Pivot 99', fontsize=14)
  pyp.xlabel('Site Number', fontsize=12)
  pyp.ylabel('Site Number', fontsize=12)
  pyp.yticks(arange(len(pivot_99.index)),pivot_99.index)
  pyp.xticks(arange(len(pivot_99.columns)),pivot_99.columns, rotation = 90)
  pyl.savefig('Pivot 99.png')
  pyl.show()
  </code></pre>
  
  <p>Where pivot_99 is a dataframe consisting of numbers between 0 and 1. The length of the index and columns are always the same but are different values for different years. When I plot pivot_99 it looks fine:
  <img src="https://i.stack.imgur.com/vJilr.png" alt="Pivot 1999"></p>
  
  <p>However when I plot the 2000 Heatmap there is extra space on the top and right.</p>
  
  <p><img src="https://i.stack.imgur.com/mHqn0.png" alt="Pivot 2000"></p>
  
  <p>Does anyone know why this is happening or how I can fix the graph so only space with color is showing? Thanks</p>