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Theory and Modern Applications

Table 4 Maximum absolute errors for q , u , and J at \(\pmb{M=20}\) and various choices of α and N for Example 5.2

From: A space-time spectral method for the time fractional diffusion optimal control problems

Errors

α

N  = 4

N  = 6

N  = 8

N  = 10

N  = 12

q

0.2

9.18E − 02

1.01E − 05

5.45E − 08

1.76E − 10

3.72E − 13

0.6

2.06E − 03

2.55E − 05

1.50E − 07

5.13E − 10

1.15E − 12

0.9

3.50E − 03

4.68E − 05

2.85E − 07

9.94E − 10

2.23E − 12

u

0.2

8.55E − 05

8.52E − 07

4.46E − 09

1.40E − 11

9.37E − 14

0.6

1.32E − 04

1.23E − 06

5.65E − 09

1.55E − 11

2.35E − 14

0.9

1.01E − 04

1.24E − 06

7.83E − 09

2.66E − 11

6.33E − 14

J

0.2

3.17E − 05

2.37E − 08

3.38E − 11

4.55E − 14

1.33E − 15

0.6

5.52E − 05

3.85E − 08

2.22E − 11

2.08E − 13

2.44E − 15

0.9

8.53E − 05

8.61E − 08

2.57E − 11

9.77E − 14

2.22E − 16