Bug fix - error when hovering pop up window

[jmuzsik]

Hi there,

This is in reference to #84.

For one, cb.formatter = matplotlib.ticker.FormatStrFormatter("") prevents a bug in matplotlib where it expects a formatter attribute. The current format does not break the animation but you will see it if you click a chart while it is running and look in your terminal. It adds x and y axis data related to the chart as well as an []. The empty array has data by default that is quite meaningless so FormatStrFormatter("") gets rid of the data inside.

My first instinct to fix this was this: img = plt.imshow(np.transpose(var.v()), and plt.colorbar(img) because of this stack overflow page. I kept this change in code as it looks to be a best practice (though I am not sure the exact benefit).

Otherwise, let me know if it works.

Jerry

[zingale]

thanks for reporting this and for the fix!