12 - Diagonal Matrix

Diagonal of a $n\times n$ Matrix

The entries $a_{11},a_{22},a_{33},\cdots ,a_{nn}$

Diagonal Matrix

Square Matrix with non-diagonal entries non-zero

Notation for a Diagonal Matrix

$$diag(c_1,c_2,\cdots ,c_n)$$

Represents a $n\times n$ diagonal matrix whose $(i,i)$th entry is $c_i$