A matrix that consists of zeros as entries (or elements) outside the main diagonal is called a diagonal matrix.

Square matrices are appeared with zeros. In a special case, a square matrix contains zero as non-diagonal elements but it contains elements only on principal diagonal. Due to having elements on leading diagonal and having zeros as non-diagonal elements, the square matrix is recognized as a diagonal matrix.

$M=\left[\begin{array}{ccccc}{e}_{1InvisibleComma;1}& 0& 0& \cdots & 0\\ 0& {e}_{2InvisibleComma;2}& 0& \cdots & 0\\ 0& 0& {e}_{3InvisibleComma;3}& \cdots & 0\\ \vdots & \vdots & \vdots & \ddots & \vdots \\ 0& 0& 0& \cdots & {e}_{mInvisibleComma;m}\end{array}\right]$

The matrix is having elements ${e}_{1\⁣1},{e}_{2\⁣2},{e}_{3\⁣3},\dots {e}_{m\⁣m}$ only on principal diagonal but observe the elements on non-diagonal areas. All are zero elements at non-diagonal areas. Therefore, this type of matrix is called a diagonal matrix. The diagonal elements can be either equal or unequal elements.

It is simply expressed as $M=diag\left[\begin{array}{ccccc}{e}_{1InvisibleComma;1,}& {e}_{2InvisibleComma;2,}& {e}_{3InvisibleComma;3,}& \cdots & {e}_{nInvisibleComma;n}\end{array}\right]$

$D$ is a square matrix of order $5\times 5$. It is having $25$ element in five rows and five columns.

$D=\left[\begin{array}{ccccc}1& 0& 0& 0& 0\\ 0& \u20135& 0& 0& 0\\ 0& 0& 7& 0& 0\\ 0& 0& 0& 3& 0\\ 0& 0& 0& 0& 9\end{array}\right]$

The matrix $D$ is having two types of elements. One type of elements are nonzero elements and remaining all are zeros. Nonzero elements ($1,\u20135,7,3$ and $9$) are placed on the leading diagonal and remaining non-diagonal elements are zeros. Therefore, the matrix $D$ is known as a diagonal matrix.

The diagonal matrix $D$ is written in simple form $D=diag\left[\begin{array}{ccccc}1,& \u20135,& 7,& 3,& 9\end{array}\right]$

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