Hi @跻 陈
To enhance your 3D plot with contours below the graph in MATLAB, you can use the "contour" or "contourf" functions to add contour lines to the 2D projection on one of the coordinate planes.
Below is the modified code for the same:
function sita45
% Define the grid
[x, y, z] = meshgrid(linspace(0, 0.04, 300), linspace(0, 0.5, 300), linspace(0, 0.2, 200));
% Define the function values
v = (3*log10(x) - 182*x - 15.079*y + 2*log10(z) - 48.912*z + 15.62);
% Create the isosurface
p = patch(isosurface(x, y, z, v, 0));
set(p, 'FaceColor', 'blue', 'EdgeColor', 'none');
% Add lighting and view
camlight('headlight');
lighting phong;
view(3);
hold on;
% Add contours on the bottom plane (z = 0)
% Extract the slice at z = 0
[X, Y] = meshgrid(linspace(0, 0.04, 300), linspace(0, 0.5, 300));
% Use a small z value to avoid log(0)
V_slice = (3*log10(X) - 182*X - 15.079*Y + 2*log10(0.0001) - 48.912*0.0001 + 15.62);
% Plot contours
contour(X, Y, V_slice, 20, 'LineColor', 'black'); % Adjust the number of contour levels as needed
% Set axis labels
xlabel('X');
ylabel('Y');
zlabel('Z');
% Set other plot properties
axis tight;
grid on;
hold off;
end
For better understanding of "contour" or "contourf" refer to the following documentation:
- contour: https://www.mathworks.com/help/matlab/ref/contour.html
- contourf: https://www.mathworks.com/help/matlab/ref/contourf.html
Hope this helps!
