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Table 1 Errors, convergence orders and CPU time for Example  1

From: A priori error analysis of stabilized mixed finite element method for reaction-diffusion optimal control problems

Mesh \(\boldsymbol {\|u-u_{h}\|_{L^{2}(\Omega)}}\) Order \(\boldsymbol {|\!|\!|\{y-y_{h},\sigma-\sigma _{h}\}|\!|\!|_{\delta}}\) Order CPU time
8*8 5.5232E-02 - 4.0521E-01 - 5s
16*16 2.7731E-02 0.99 1.9822E-01 1.03 26s
32*32 1.3741E-02 1.01 9.8230E-02 1.01 127s
64*64 6.9009E-03 0.99 4.8929E-02 1.01 761s