Two Legendre-Dual-Petrov-Galerkin Algorithms for Solving the Integrated Forms of High Odd-Order Boundary Value Problems

Table 3

Maximum pointwise error 𝐸 for Example 1.

𝑁	𝜂0	𝜂1	𝜂2	LDPG—1st choice	LDPG—2nd choice
18	0	0	0	2.20843×10^−14	5.40665×10^−15
20				3.06209×10^−14	6.58881×10^−15
22				7.61484×10^−14	3.63132×10^−15
18	1	−1	−1	1.14394×10^−13	5.25079×10^−15
20				1.00142×10^−13	2.18044×10^−15
22				2.17211×10^−13	5.40459×10^−15
18	16	−16^2	−16^3	1.15044×10^−13	2.02084×10^−15
20				1.65338×10^−14	1.08947×10^−14
22				5.91763×10^−13	7.53041×10^−14