-- will any of the exercise-specific script up-top have any danger of clashing with one another in summative exercises? (thinking about what happened with the trigonometry exercises)
-- is it easy to…
This patch:
* flips the matrix so that it is right side up, and flips the y-axis to correctly label the rows, unless origin='lower' is specified.
* Adds matplotlib's vmin and vmax parameters, which …