Question

What is a scalar matrix?

Answer 1

Scalar matrix:

• The scalar matrix is a diagonal matrix, in which the diagonal contains the same element.
• The scalar matrix is obtained by the product of the identity matrix and a scalar number.

Example:

$A=\left[\begin{array}{ccc}2& 0& 0\\ 0& 2& 0\\ 0& 0& 2\end{array}\right]$