title: Matplotlib density plot in polar coordinates?
body: <p>I have an array saved as a txt file that has entries corresponding to the value of a distribution in polar coordinates. So it looks like this:</p>
  
  <pre><code>  f(r1,theta1) f(r1, theta2) ..... f(r1, theta_max)
    f(r2,theta1) f(r2, theta2) .....        .
          .                                 .
          .                                 .
          .                                 .
    f(r_max,theta1) .................f(r_max, theta_max)
  </code></pre>
  
  <p>I want to do a density plot of f (the higher f is, the more red I want the color to be). Is there a way to do this with matplotlib? Explicit code would be helpful, as I am majorly new to this.</p>