title: Vector/matrix rotation debugging
body: <p>This may be too much math, but is really a programming ddbugging question.
  I do a lot of flying vehicle navigation, control system and simulations. I'm a 5th year uni student.</p>
  <p>I don't have a hard time with math at all, but when implementing code for all kinds of model rotation and translation, I have a hard time of debugging if something is wrong with my code.</p>
  <p>What's  generally best practice for keeping track if some vector, matrix, direction or angle is off?
  I use python and some C. A vizualisation library good with angles is also appreciated, or is matplotlib simply the solution?
  It would al</p>