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Some famous Matrices
- Diagonal if a_{ij}=0 for i\ne j
- Upper triangular if a_{ij}=0 for i > j
- Lower triangular if a_{ij}=0 for i < j
- Upper Hessenberg if a_{ij}=0 for i > j+1
- Lower Hessenberg if a_{ij}=0 for i < j+1
- Tridiagonal if a_{ij}=0 for |i -j| > 1
- Lower banded with bandwidth p : a_{ij}=0 for i > j+p
- Upper banded with bandwidth p : a_{ij}=0 for i < j+p
- Banded, block upper triangular, block lower triangular....