The Matrix Market

Home Search Browse Resources

DORR: A tridiagonal, diagonally dominant, possibly ill-conditioned matrix

from the MMDELI

Matrix Generator DORR
Source: F. W. Dorr
Discipline: numerical linear algebra
Language: Java applet
Output format: Matrix Market format

This is a Java applet which generates a diagonally dominant, tridiagonal M-matrix which is ill-conditioned for small values of the parameter THETA>=0. All rows except the first and last have |A(i,i)| = |A(i,i-1)| + |A(i,i+1)|. The first and last rows are strictly diagonally dominant by THETA*(N+1)2, e.g. |A(1,1)| = |A(1,2)| + THETA*(N+1)2.

This generator was developed by Bruce Miller of NIST based on Nick Higham's Test Matrix Toolbox for MATLAB.


Norder of the matrix.
THETAaffects the amount of diagonal dominance.


The Matrix Market is a service of the Mathematical and Computational Sciences Division / Information Technology Laboratory / National Institute of Standards and Technology.

[ Home ] [ Search ] [ Browse ] [ Resources ]

Last change in this page: Wed Sep 22 13:34:20 US/Eastern 2004 [Comments: ]