Efficiency of High-Order Accurate Difference Schemes for the Korteweg-de Vries Equation

Table 3

Invariants of , , and of the compact fourth-order finite difference scheme (11).

0	2.0000000000	0.6666666667	1.2058836346
10	1.9999449243	0.6666680888	1.2059201473
20	2.0001106778	0.6666680896	1.2059186978
30	1.9999055324	0.6666679386	1.2059155167
40	2.0001880153	0.6666680804	1.2059193791
50	1.9999670401	0.6666680255	1.2059262538
60	1.9998768932	0.6666679688	1.2059162036