Research Article
A Polynomial Preconditioner for the CMRH Algorithm
| | No. of restarts | Time (sec) | Residual norm | Convergence |
| 1 | 1000 | 2.7500 | 0.0011 | No | 2 | 171 | 0.4690 | 9.4299e − 11 | Yes | 3 | 289 | 0.7810 | 9.4596e − 11 | Yes | 4 | 177 | 0.4840 | 9.9338e − 11 | Yes | 5 | 236 | 0.6560 | 9.6960e − 11 | Yes | 6 | 50 | 0.1250 | 9.6988e − 11 | Yes | 7 | 72 | 0.2030 | 6.8890e − 11 | Yes | 8 | 60 | 0.1720 | 8.5579e − 11 | Yes | 9 | 75 | 0.2190 | 7.7776e − 11 | Yes | 10 | 34 | 0.1090 | 5.8616e − 11 | Yes | 11 | 40 | 0.1250 | 5.5309e − 11 | Yes | 12 | 32 | 0.1090 | 6.1764e − 11 | Yes | 13 | 28 | 0.0780 | 8.4069e − 11 | Yes | 14 | 23 | 0.0780 | 3.6570e − 11 | Yes | 15 | 23 | 0.0940 | 7.6101e − 11 | Yes | 16 | 17 | 0.0780 | 4.8057e − 11 | Yes | 17 | 18 | 0.0780 | 8.7496e − 12 | Yes | 18 | 11 | 0.0620 | 7.8930e − 12 | Yes | 19 | 7 | 0.0470 | 3.5654e − 12 | Yes | 20 | 14 | 0.0620 | 1.3220e − 11 | Yes |
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