Approximation Properties of a Gradient Recovery Operator Using a Biorthogonal System

Table 2

-errors for the exact gradient and the recovered gradient, Example 2.

Level	# elem.
1	256	2.04366e − 03		5.43131e − 04
2	1024	7.32136e − 04	1.48	1.36444e − 04	1.99
3	4096	2.60025e − 04	1.49	3.41525e − 05	2.00
4	16384	9.20937e − 05	1.50	8.54072e − 06	2.00
5	65536	3.25843e − 05	1.50	2.13534e − 06	2.00