20 May 2024 08:00:14 AM

porous_medium_exact_test():
  C++ version
  Test porous_medium_exact(),
  an exact solution of the porous medium equation.

  parameters:
    c = 0.11547
    delta = 0.0133333
    m = 3
    t0 = 0
    tstop = 4

porous_medium_residual_test():
  Evaluate solution and residual at selected points (X,T)

      X       T       U(X,T)      Resid(X,T)

        -1         0           0           0
      -0.8         0           0           0
      -0.6         0           0           0
      -0.4         0  1.09629e-08  9.53674e-07
      -0.2         0    0.866025  -7.10543e-15
         0         0           1  -7.10543e-15
       0.2         0    0.866025  -7.10543e-15
       0.4         0  1.09629e-08  9.53674e-07
       0.6         0           0           0
       0.8         0           0           0
         1         0           0           0

        -1         1    0.180197  -2.77556e-17
      -0.8         1    0.249151  1.38778e-17
      -0.6         1    0.291724  -4.16334e-17
      -0.4         1    0.318669  -1.38778e-17
      -0.2         1    0.333794  1.38778e-17
         0         1    0.338685  -1.38778e-17
       0.2         1    0.333794  1.38778e-17
       0.4         1    0.318669  -1.38778e-17
       0.6         1    0.291724  -4.16334e-17
       0.8         1    0.249151  1.38778e-17
         1         1    0.180197  -2.77556e-17

        -1         2     0.19997  -1.38778e-17
      -0.8         2    0.234284  6.93889e-18
      -0.6         2    0.257834           0
      -0.4         2    0.273416  -6.93889e-18
      -0.2         2    0.282353  -1.38778e-17
         0         2     0.28527           0
       0.2         2    0.282353  -1.38778e-17
       0.4         2    0.273416  -6.93889e-18
       0.6         2    0.257834           0
       0.8         2    0.234284  6.93889e-18
         1         2     0.19997  -1.38778e-17

        -1         3     0.19714  3.46945e-18
      -0.8         3    0.220952           0
      -0.6         3     0.23783  -3.46945e-18
      -0.4         3    0.249187  -3.46945e-18
      -0.2         3    0.255759           0
         0         3    0.257913           0
       0.2         3    0.255759           0
       0.4         3    0.249187  -3.46945e-18
       0.6         3     0.23783  -3.46945e-18
       0.8         3    0.220952           0
         1         3     0.19714  3.46945e-18

        -1         4    0.192028           0
      -0.8         4    0.210594  3.46945e-18
      -0.6         4    0.223973           0
      -0.4         4     0.23306  -1.73472e-18
      -0.2         4    0.238345           0
         0         4    0.240081           0
       0.2         4    0.238345           0
       0.4         4     0.23306  -1.73472e-18
       0.6         4    0.223973           0
       0.8         4    0.210594  3.46945e-18
         1         4    0.192028           0


porous_medium_exact_test():
  Normal end of execution.
20 May 2024 08:00:14 AM