09-Jul-2023 06:47:58 fd2d_poisson_test(): MATLAB/Octave version 5.2.0 fd2d_poisson() is a simple Poisson equation solver for a rectangular region. Using a 21 by 41 grid The RMS error was 0.00585933 fd2d_poisson_test(): Normal end of execution. 09-Jul-2023 06:48:00