N

$FGM{C}_{1-1-3}$

收敛阶

$FGM{C}_{1-2-2}$

收敛阶

$FGM{C}_{2-2-2}$

收敛阶

N = 8

7.44e−06

6.64e−07

2.16e−06

N = 12

4.05e−07

7.18

8.41e−08

5.09

9.81e−08

7.62

N = 16

6.47e−08

6.38

1.68e−08

5.60

1.01e−08

7.90

N = 20

1.46e−08

6.67

4.15e−09

6.27

1.70e−09

7.99

N = 24

4.24e−09

6.78

1.27e−09

6.51

3.91e−10

8.07

N = 28

1.48e−09

6.83

4.55e−10

6.64

1.14e−10

8.00

N = 32

5.92e−10

6.86

1.88e−10

6.63

3.87e−11

8.10

收敛阶

7.00

7.00

8.00