Math Help

What is an identity matrix?

An identity matrix is also called a unit matrix. An identity matrix is a square matrix in which:

• all the elements of the diagonal between the top left corner and the bottom right hand corner are ones and
• all the other elements are zeros.

Identify Matrices

Below are example of identity matrices.

,

Property of the identity matrix

The identity matrix is very useful because of the following property which you can assume for all identity matrices. If I represents the identity matrix and A is any other matrix, then:

Example of calculation with the identity or unit matrix

Related posts

• Sorry, no related posts at this time.