I love Matrix solutions. When I was in school, I thought that using linear programming (utilizing matrix methods) to solve problems , especially in Operations Research, was the neatest thing I ever saw. Well almost, I'm still in total awe of the D'alambertian(sp?) 4 dimensional matrix, which equated the electric and magnetic fields in space-time. I think Feynman came up with that. Up with Matrix Mechanics!!!!