Mathematics-Online lexicon: Especially Structured Matrices

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	Mathematics-Online lexicon:
	Especially Structured Matrices

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With respect to the arrangement of non-zero matrix elements $a_{i,j}$ we distinguish between different types of matrices:

Diagonal matrices: $a_{i,j}=0$ for $i\ne j$ ;
Banded matrices: $a_{i,j}=0$ for $\vert i-j\vert>k$ , where is the number of non-zero diagonals, called band width.
Upper (lower) triangular matrices: $a_{i,j}=0$ for ();

Generally, an $(m\times n)$ -matrix is called weakly occupied if there are only $c\max(m,n)$ non-zero elements, where is a not too large constant.

(Authors: App/Burkhardt/Höllig)

see also:

automatically generated 1/27/2005