A Polynomial Preconditioner for the CMRH Algorithm

Table 3

𝑘𝑘	No. of restarts	Time (sec)	Residual norm	Convergence
1	518	60.4840	9.4131e − 11	Yes
2	499	59.3440	9.6438e − 11	Yes
3	481	57.2650	8.2944e − 11	Yes
4	625	75.1720	9.7851e − 11	Yes
5	639	77.7970	9.6175e−11	Yes
6	934	113.6710	9.7319e − 11	Yes
7	680	84.7190	9.9634e − 11	Yes
8	649	82.4840	9.8637e − 11	Yes
9	747	94.9220	9.3972e − 11	Yes
10	824	104.3750	6.7137e − 11	Yes
11	940	118.8590	8.5893e − 11	Yes
12	585	79.5790	9.8813e − 11	Yes
13	690	93.1400	8.4271e − 11	Yes
14	640	89.2820	9.6628e − 11	Yes
15	599	84.9530	9.8641e − 11	Yes
16	755	104.5470	9.8972e − 11	Yes
17	553	81.8440	9.0119e − 11	Yes
18	730	104.3910	9.3932e − 11	Yes
19	611	90.2970	8.6073e − 11	Yes
20	660	97.0460	9.8196e − 11	Yes