There is an unusually large number of commands on the TI-68k calculators dealing with matrices (as you may have noticed from reading the article). I've tried to present them in in groups, dividing them into categories based roughly on the way they work. As a result, however, the list on the bottom of the page isn't complete (although I think if I tried to cover every matrix command, I'd end up listing half the catalog).
Matrices and Their Commands / Discussion
This is the discussion related to the wiki page Matrices and Their Commands.