Diagonal matrix
This is an old revision of this page, as edited by Karajou (talk | contribs) at 16:14, April 24, 2012. It may differ significantly from current revision.
A diagonal matrix is a square matrix all of whose nonzero entries are along the main diagonal. Examples include the identity matrix, the zero matrix, and the matrix: <math> \left(\begin{matrix} 1 &0 &0\\ 0 &2 &0\\ 0 &0 &3\end{matrix}\right) </math>
The eigenvalues of a diagonal are the non-zero elements.
This is a special case of a Triangular matrix.