Table 1: Error analysis of first and second order of accuracy difference schemes for Example 3.1.

Method 𝑁 = 𝑀 = 2 5 𝑁 = 𝑀 = 5 0 𝑁 = 𝑀 = 1 0 0

1st order of accuracy 0.2553 0.1256 0.0622
2nd order of accuracy 0.0062 9 . 7 7 1 × 1 0 4 1 . 9 6 3 × 1 0 4