NEKG33 Mathematical methods for economists

Chapter 23 : Day 23: Matrix multiplication

By Lund University

Not as simple as multiplying two numbers but not too hard either.

Matrix multiplication

This section is an entirely devoted to matrix multiplication. We look at under which conditions you are allowed to multiply two matrices, the exact method of how to multiply two matrices and all the rules that apply to matrix multiplication.

Dot product

Matrix multiplication, dimension

Matrix multiplication, computation

Matrix multiplication, rules

Matrix multiplication: Problems

Exercises on matrix multiplication

Problem: Input and output vectors

Problem: Input and output vectors

Problem: Matrix products

Problem: Matrix algebra

Problem: Matrix algebra

Problem: The distributive law for matrices

Problem: Matrix products

Problem: Idempotent matrices

Problem: Transpose matrix expressions