In linear algebra, a tridiagonal matrix is a band matrix that has nonzero elements only on the main diagonal, the subdiagonal/lower diagonal (the first diagonal below this), and the supradiagonal/upper diagonal (the first diagonal above the main diagonal). For example, the following matrix is tridiagonal: ( 1 4 0 0 3 4 1 0 0 2 3 4 0 0 1 3 ) .
In linear algebra, a tridiagonal matrix is a band matrix that has nonzero elements only on the main diagonal, the subdiagonal/lower diagonal (the first diagonal below this), and the supradiagonal/upper diagonal (the first diagonal above the main diagonal). For example, the following matrix is tridiagonal: ( 1 4 0 0 3 4 1 0 0 2 3 4 0 0 1 3 ) .
Source: Wikipedia "Tridiagonal matrix" · CC BY-SA 4.0
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