Accelerated Circulant and Skew Circulant Splitting Methods for Hermitian Positive Definite Toeplitz Systems

Table 7

Numerical results of 2D examples for CSCS method with optimal 𝛼.

𝑛	Sequence (a)		Sequence (b)		Sequence (c)
	𝛼^∗	IT	𝛼^∗	IT	𝛼^∗	IT
8	2.48	26	2.31	23	1.18	15
16	3.75	35	3.53	31	1.79	20
32	5.14	42	4.65	36	2.41	25
64	6.33	44	5.70	39	3.17	30
128	7.39	44	6.74	39	3.93	34