Skip to main content

Theory and Modern Applications

Table 2 Comparing results to solve Example 1 by the GPIU algorithm with \(\omega =1\), \(\delta =0.99\) and \(s = 0.01\), and the CGNR method for \(\alpha =1.2\), 1.5 and 1.8

From: A GPIU method for fractional diffusion equations

α

N

M

GPIU

CGNR

HSS

CPU (s)

Iter

Error

CPU (s)

Iter

Error

CPU (s)

Iter

Error

1.2

26

33

0.0266

4

3.63e − 08

0.1506

49

1.12e − 07

0.1199

18.36

2.88e − 07

27

74

0.0939

3.96

1.64e − 07

0.5807

53

1.32e − 06

0.5460

18.92

7.19e − 07

28

170

0.8145

3.86

5.18e − 07

2.5166

54

1.19e − 06

3.9674

19

1.33e − 06

29

389

10.6105

3.8123

1.12e − 06

41.0703

54

1.38e − 06

62.5631

19

3.37e − 06

1.5

26

93

0.0481

4

2.72e − 08

0.4913

58

1.06e − 06

0.2374

20.79

3.27e − 07

27

259

0.3301

3.98

1.73e − 07

2.0613

62

1.35e − 06

1.7875

20.95

8.05e − 07

28

728

3.3763

3.93

5.68e − 07

13.5068

65

1.09e − 06

19.7542

21

1.59e − 06

29

2054

52.4298

3.92

1.27e − 07

250.4274

65

1.19e − 06

337.2273

21

4.19e − 06

1.8

26

263

0.0994

4

2.42e − 08

1.3840

67

1.17e − 07

0.5653

22.95

3.74e − 07

27

904

1.1810

3.96

2.88e − 07

8.3969

73

1.30e − 06

5.8788

22.99

9.07e − 07

28

3126

12.2058

3.89

7.06e − 07

60.9816

77

1.40e − 06

72.6848

23

2.69e − 06