Numerical Method for Solving Matrix Coefficient Elliptic Equation on Irregular Domains with Sharp-Edged Boundaries

Table 3

Numerical error of the problem with “target” shape.

𝑛𝑥×𝑛𝑦	Error in 𝑢^−	Order
20 × 20	0.0034
40 × 40	8.44𝑒−004	1.99
80 × 80	2.14𝑒−004	1.98
160 × 160	5.35𝑒−005	2.00