How to draw a semi-circular heat map?(怎么画半圆形的热力图)

How to draw such a heatmap, should I use 'polaroplot' or 'colormap'?

怎么画出这样的热力图，应该使用polarplot还是colormap？

[Walter Roberson]

Maybe adjust https://www.mathworks.com/matlabcentral/fileexchange/67597-cirheatmap ?

Answer 1

[Star Strider]

The general approach would be to create a rectangular array first, and then use the cart2pol function to create it as a semicircular area.

Example —

a = linspace(0, pi, 80);                                    % Angle Vector
r = linspace(0, 12, 24);                                    % Radius Vector

[A,R] = ndgrid(a,r);                                        % Corresponding Matrices

Z = ones(size(A))*0.1;                                                      % 'Z' Is Initially Flat
% Z(10:20,10:15) = 2+exp(-(Z(10:20,10:15)-50).^2*5);        % Create 'Prominence' In 'Z'
for k = 1:10
    Z(10+k,(2:3)+2*k) = 2+exp(-(Z(10+k,(2:3)+2*k)-10*rand).^2*500);     % Create 'Prominence' In 'Z'
end

figure
surf(A,R,Z, 'EdgeColor','interp', 'FaceColor','interp')
xlabel('Angle')
ylabel('Radius')
title('Rectangular Array')
clim([-0.01 1.8])
colormap(turbo)
colorbar

[X,Y,Z] = pol2cart(A,R,Z);

figure
surf(X,Y,Z, 'EdgeColor','interp', 'FaceColor','interp')
axis('equal')
clim([-0.01 1.8])
colormap(turbo)
colorbar
title('Polar Surface')

figure
surf(X,Y,Z, 'EdgeColor','interp', 'FaceColor','interp')
axis('equal')
clim([-0.01 1.8])
colormap(turbo)
view(0,90)
colorbar('Location','southoutside')
title('Polar Surface (Top View)')

You will have to add the appropriate arcs and annotations. To plot the arcs, use plot3 (since this is a 3D surface plot), and text for the alphanumeric information.

EDIT — (11 Aug 2024 at 32:02)

Changed ‘Z’.

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