Hi,
I understand that you want to plot the figure without the triangular region specified in the first image.
For this, you can mask out that region using a custom polygon with “inpolygon” function. This way, you retain full control over which parts of the contour map are visible, ensuring that it matches with your second image.
You can consider updating your code like this:
xi = linspace(min(x), max(x), 300);
yi = linspace(min(y), max(y), 300);
[XI, YI] = meshgrid(xi, yi);
ZI = griddata(x, y, z, XI, YI);
% Define a polygon to exclude the top-right triangular area
% This creates a mask that only includes valid plotting region
polyX = [0 0 12 12 10]; % x-coordinates of the polygon
polyY = [0 12 12 10 12]; % y-coordinates of the polygon
% Create mask
in = inpolygon(XI, YI, polyX, polyY);
ZI(~in) = NaN; % Set values outside the polygon to NaN (will not be plotted)
% Plot the contour
figure
contourf(XI, YI, ZI, 'edgecolor', 'none')
colormap(flipud(jet(10)))
shading interp
colorbar
title('X MOMENT', 'FontSize', 14)
grid on
grid minor
hold on
scatter(x, y, 'k', 'filled');
hold off
- You can adjust “polyX” and “polyY” according to your mesh layout.
- The “inpolygon” function checks whether each point in your interpolation grid lies inside the valid domain.
- Setting ZI(~in) = NaN ensures MATLAB ignores the invalid triangular region during contour plotting.
For more details about inpolygon, you can refer to the following documentation:
web(fullfile(docroot, 'matlab/ref/inpolygon.html'))
