Matrices

 My notes about matrices 

(This page is in progress and will be updated with more notes)

Matrix  A is a structure of mathematical objects( e.g. numbers) arranged into rows and columns. 

Transposed matrix A^T has the same elements as matrix A just the rows are turned into columns.

Diagonal matrix has zeroes outside the main diagonal.

Upper triangular matrix has all elements bellow the main diagonal zeroes.

Lower triangular matrix has all elements above the main diagonal zeroes.

Identity matrix has zeroes bellow and above the main diagonal and the main diagonal is only 1s.