Question

Classify each of the following matrices as a row, a column, a square, a diagonal, a scalar, a unit, an upper traingular, a lower triangular matrix.

`[(1, 0, 0),(0, 1, 0),(0, 0, 1)]`

Answer 1

Let A = `[(1, 0, 0),(0, 1, 0),(0, 0, 1)]`

In matrix A, all the non-diagonal elements are zero and diagonal elements are one.
∴ A is a unit (identity) matrix.