Seems like GE on a 2x2 matrix should be pretty darn fast.... especially if you use scalar * vector type operations.

Journal of the Royal Statistical Society. Series C (Applied Statistics), Vol. 34, No. 2 (1985), pp. 193-198 (6 pages) ...

Let ${\mathrm{Z}}_{{\mathrm{M}}_{1}\times \mathrm{N}}={\mathrm{T}}^{\frac{1}{2}}\mathrm{X}$ where (T½)2 = T is a positive definite matrix and X consists of ...

One of the essential dilemmas in our lives is choosing between what is urgent and what is important. Years ago, Stephen Covey placed both issues on a 2x2 matrix, giving new light by having us consider ...

Physics and Python stuff. Most of the videos here are either adapted from class lectures or solving physics problems. I really like to use numerical calculations without all the fancy programming ...