Polar Label Type Contour

I have 3 types of data. The first data is the angle, the second data is the radial distance, the third data is the pre-calculated data as a function of the first two data.

precomputed data

angle=[a1;a2;a3...];

radial =[r1;r2;r3..];

value=[var1;var2;var3...];

I tried this but ı didnt good result i think i'm wrong: The z values ​​must be a value in the x and y coordinates, not a function of x and y.

for example

angle = [0 36 72 108 144 180 216 252 288 324 360];

radial = [0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1];

value=[0.1;0.2;...........];

[a,r] = meshgrid(angle,radial);

[x,y] = pol2cart(a,r);

value = [var1;var2;var3...];; %must be located in x y coordinates

contourf(X,Y,Z,'ShowText','on')

daspect([1 1 1])

How can I obtain the circular contour distribution that indicates the position of the data calculated with the angle and distance data according to the angle and radial distance and writes (for example c label type) the value as a number?

I am sharing the similar graph that I want to achieve in the attachment.

Answer 1

[ag]

Hi Alexi,

To create a circular contour plot using your angle, radial distance, and precomputed values, you will need to map your data onto a grid in Cartesian coordinates, then use the "contourf" function to visualize it.

The below code snippet shows how to achieve this using dummy data:

angle = [0 36 72 108 144 180 216 252 288 324 360];
radial = [0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1];
value = rand(length(radial), length(angle));

% Create a meshgrid
[a, r] = meshgrid(deg2rad(angle), radial);

% Convert polar coordinates to Cartesian coordinates
[x, y] = pol2cart(a, r);

% Plot using contourf
figure;
contourf(x, y, value, 'ShowText', 'on');
colorbar;
title('Circular Contour Plot');
xlabel('X');
ylabel('Y');

For more details, please refer to the following MathWorks documentations:

• meshgrid - https://www.mathworks.com/help/matlab/ref/meshgrid.html
• contourf - https://www.mathworks.com/help/matlab/ref/contourf.html

Hope this helps!