NEKG33 Mathematical methods for economists
Chapter 22 : Day 22: Matrices
By Lund University
Welcome to the matrix!
Introduction to matrices
In the first section of this chapter we introduce matrices. We will then look at some special matrices such as diagonal matrices and the identity matrix. We then look at the row and column vectors and vectors in general.
Row- and column vectors
Addition, scalar multiplication and transpose
We look at how to add to matrices and when you are allowed to add to matrices (same dimension). It is also possible to multiply and matrix by a scalar and we look at all the algebraic rules for matrix addition and scalar multiplication. In the final lecture we study the transpose of a matrix and related concepts such as symmetric matrices.
Matrix addition and scalar multiplication
Algebraic rules for matrix addition and scalar multiplication
Exercises on matrices