Table 4: Effectiveness of the Hessenberg-Schur method and WBR algorithm with 3 iterations for randomly generated matrices.

Matrix Hessenberg-Schur WBR method
ErrorCPU-timeErrorCPU-time

A = gallery (“wathen”, 736, 736) 66.24 49.95
A = gallery (“toeppd”, 800, 800, r and (1,800) 72.19 54.81
A = gallery (“dorr”, 1200, 0.01) 137.113 101.02
A = gallery (“neumann”, 1156) 122.71 94.29