📅  最后修改于: 2022-03-11 14:55:48.828000             🧑  作者: Mango
Diagonal Matrix:
A diagonal matrix is a matrix in which the entries outside the main
diagonal are all zero. The term usually refers to square matrices.
A = 1 0 0
0 2 0
0 0 3
Here A is a 3x3 identity matrix