For instance, the main diagonal of the 4-by-4 matrix above contains the elements a11 = 9, a22 = 11, a33 = 4, a44 = 10.
For eksempel er hoveddiagonalen i 4x4-matricen i Fig 1 bestående af a11 = 9, a22 = 11, a33 = 4, a44 = 10.