Lab2

Here are my suggested edits to lab2. After talking to the TAs and students in the class, we decided that timing things was too complicated for a beginning lab (not to mention that it isn't part of this lab's objective), so we removed those problems. The plan is to include timing in the profiling lab.
Here, when you talk about indexing the rows and indexing the columns for the axes, it's not really clear. You use an example in the "More Methods" section, but it turned out differently than I imagined based on your description of the axes. Maybe a quick example here would make make things clear.