04 October 2024 01:11:44 PM poisson_2d_test(): C version Test poisson_2d(). poisson_2d(): A program for solving the Poisson equation. -DEL^2 U = F(X,Y) on the rectangle 0 <= X <= 1, 0 <= Y <= 1. F(X,Y) = pi^2 * ( x^2 + y^2 ) * sin ( pi * x * y ) The number of interior X grid points is 161 The number of interior Y grid points is 161 The X grid spacing is 0.006250 The Y grid spacing is 0.006250 RMS norm of F = 5.91904 RMS of exact solution = 0.620835 Step ||Unew|| ||Unew-U|| ||Unew-Exact|| 0 0.0785659 0.615844 500 0.230766 0.000195725 0.498491 1000 0.282249 0.000127406 0.437281 1500 0.320729 9.87791e-05 0.388848 2000 0.352434 8.16059e-05 0.348142 2500 0.379583 6.9597e-05 0.312989 3000 0.403294 6.0476e-05 0.282162 3500 0.42425 5.31903e-05 0.254861 4000 0.442912 4.71739e-05 0.23052 4500 0.459619 4.20887e-05 0.208716 5000 0.474634 3.77168e-05 0.189116 5500 0.488166 3.39098e-05 0.171453 6000 0.500388 3.05623e-05 0.155504 6500 0.511445 2.75964e-05 0.141083 7000 0.52146 2.49534e-05 0.128029 7500 0.530541 2.25875e-05 0.116203 8000 0.538781 2.04622e-05 0.105484 8500 0.546262 1.85481e-05 0.0957623 9000 0.553057 1.68207e-05 0.0869434 9500 0.559231 1.52594e-05 0.0789409 10000 0.564841 1.38466e-05 0.071678 10500 0.569941 1.2567e-05 0.0650852 11000 0.574577 1.14072e-05 0.0591002 11500 0.578792 1.03557e-05 0.0536665 12000 0.582623 9.40182e-06 0.048733 12500 0.586107 8.53634e-06 0.0442534 13000 0.589274 7.75089e-06 0.0401858 13500 0.592154 7.03794e-06 0.0364923 14000 0.594772 6.39074e-06 0.0331384 14500 0.597152 5.80317e-06 0.0300928 15000 0.599315 5.26969e-06 0.0273272 15500 0.601282 4.78531e-06 0.0248157 16000 0.603069 4.34549e-06 0.0225351 16500 0.604694 3.94611e-06 0.020464 17000 0.606171 3.58346e-06 0.0185833 17500 0.607513 3.25414e-06 0.0168754 18000 0.608732 2.9551e-06 0.0153245 18500 0.609841 2.68354e-06 0.013916 19000 0.610848 2.43694e-06 0.012637 19500 0.611763 2.21301e-06 0.0114756 20000 0.612594 2.00965e-06 0.0104208 20500 0.61335 1.82498e-06 0.009463 21000 0.614036 1.65728e-06 0.00859319 21500 0.61466 1.50499e-06 0.00780331 22000 0.615226 1.3667e-06 0.00708601 22500 0.615741 1.24111e-06 0.00643463 23000 0.616208 1.12707e-06 0.0058431 23500 0.616633 1.0235e-06 0.00530592 23621 0.61673 9.99905e-07 0.00518352 The iteration has converged. Wall clock time in seconds is 56.9204 poisson_2d_test(): Normal end of execution. 04 October 2024 01:12:41 PM