A Double-Parameter GPMHSS Method for a Class of Complex Symmetric Linear Systems from Helmholtz Equation

Table 10

Convergence results for the IDGPMHSS iteration with 𝑚=32.

(𝛼^∗𝐺,𝛽^∗𝐺)(𝛼^∗𝐺,𝛽^∗𝐺)	𝜎2	𝜏=0.95			𝜏=0.9			𝜏=0.85
		it.s	avg1	avg2	it.s	avg1	avg2	it.s	avg1	avg2
(1.1, 1)	10	66	27.1	23.6	90	34.2	31.1	111	40.0	37.2
(1.5, 1)	50	70	30.6	23.7	93	37.5	31.3	114	43.4	37.4
(2.2, 1)	80	75	35.0	24.2	97	41.1	31.8	118	47.0	37.8
(1.8, 1)	100	77	36.1	25.3	98	42.2	32.4	119	48.0	38.3