This is a Java applet which generates matrices from three ill-conditioned classes. These were posed by Cline and Rew as counter-examples to the condition number estimator used in the LINPACK package. Examples B and C are nearly diagonal, whereas example D is lower triangular matrix with 1s on the diagonal (except the last which is -1) and -1s on the off-diagonals.

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

Parameters:

EXAMPLE

selects one of three examples

N

order of the matrix

THETA

a linear contribution to elements in Examples B and C