08-Jan-2022 10:06:35 surf_test(): MATLAB/Octave version 9.8.0.1380330 (R2020a) Update 2 Test surf(). SURF_TEST01 SURF can plot a 3D surface Z = F(X,Y). Graphics saved as "surf_test01_3d.png". Graphics saved as "surf_test01_2d.png". surf_test(): Normal end of execution. 08-Jan-2022 10:06:50