### Episode 04b (37:18):

Wizard-level matrix wrangling

#### Summary:

Living in matrix world is all about having superpowers. Starting with a thorough revisiting of the definition of matrix multiplication, we first show how we can perform inner products and outer products the matrix way. We then go for broke with block multiplication and all important ways of seeing how $\mathbf{A}\vec{x}$, $\vec{y}^{\rm T}\mathbf{A}$, and $\mathbf{A}\mathbf{B}$ can all be performed with a bigger picture approach to multiplication. Embrace the goodness.

#### Best dined upon by 2016/09/07

#### Duration: 37:18