09-Jul-2023 08:13:26 fd3d_poisson_test(): MATLAB/Octave version 5.2.0 fd3d_poisson() is a simple Poisson equation solver for a 3d rectangular block region. Using a 5 by 5 by 5 grid The RMS error was 0.00367301 fd3d_poisson_test(): Normal end of execution. 09-Jul-2023 08:13:26