Appendix B

Matrices: An introduction to matrix algebra

B.1 Multiplication by a constant

Let us define matrices X and Y with i rows and j columns (i × j):

When multiplying a matrix by a constant each matrix element has to be multiplied:

B.2 Adding matrices

Adding (or subtracting) matrices can be done only for matrices of the same order. When X and Y are i × j matrices, the corresponding xij and yij elements are summed (or subtracted) to give a resulting matrix Z of the same size i × j:

The properties of ...

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