title: Is there a tutorial for creating a hexbin heat map using Matplotlib?
body: <p>I'm trying to learn how to do a heatmap in Python using matplotlib. I'm going to be plotting a series of locations in a huge X,Y grid based off of an array of tuples. I found <a href="https://stackoverflow.com/questions/2369492/generate-a-heatmap-in-matplotlib-using-a-scatter-data-set">this code example</a> which gives a perfect example of what I want to do. I can't seem to understand what the different parts of it mean though. Ultimately I want to output this on an overlay of an existing image. Thanks!</p>