An matrix (square matrix) of the form
Let be an matrix. If there exists an matrix satisfying and , then is said to be invertible, and is called the inverse of , denoted by . If is not invertible, we call a singular matrix.
In Matlab/Octave the function eye(n) generates the identity matrix. For example,
> eye(5)creates the identity matrix.
EXAMPLE 1 Find and identity matrix.