# Diagonal Matrix

## Diagonal Matrix

A square matrix in which all the elements outside the main diagonal are zero.

The elements of the diagonal are the elements whose indices are equal : $$a_{1,1},\space a_{2,2},\space a_{3,3},\space …$$.

### Examples

$$\begin{pmatrix}2 & 0 & 0\\0 & –5 & 0\\0 &0 & –7\end{pmatrix}$$  ,  $$\begin{pmatrix}2 & 0 & 0\\0 & 0 & 0\\0 &0 & –7\end{pmatrix}$$  ,  $$\begin{pmatrix}2 & 0\\0 & –5\end{pmatrix}$$