I have a complicated algorithm that updates 3 histograms that are stored in arrays.  I want to debug my algorithm, so I was thinking of showing the arrays as histograms in a user interface.  What is the easiest way to do this.  (Rapid application development is more important than optimized code.)
I have some experience with Qt (in C++) and some experience with matplotlib.
(I'm going to leave this question open for a day or two because it's hard for me to evaluate the solutions without a lot more experience that I don't have.  Hopefully, the community's votes will help choose the best answer.)
I recommend using matplotlib in interactive mode, if you call .show once then it will pop up in its own window, if you don't then it exists only in memory and can be written to a file when you're done with it.
How do I display real-time graphs in a simple UI for a python program?