title: Changing labels in matplotlib polar plot
body: <p>I am using matplotlib to create polar plots to represent Rose Diagrams. Right now the plot is getting created perfectly. I want to replace the angles being displayed on the axis with direction names: N for 0 degrees, W for 90 degrees, S for 180 degrees and E for 270 degrees.</p>
  
  <p>The current rose diagram looks like the following:
  <img src="https://i.stack.imgur.com/00TNE.png" alt="enter image description here"></p>
  
  <p>Note: I have tried with windrose but this output is more appropriate for my purpose. Hence a good way of assigning custom labels to the axes will be very helpful.</p>
  
  <p>The python version I am using is 2.6 with matplotlib version 1.2.0</p>