Question

I would like to represent some data depending on the angle of measure. I have something like that:

angle=[0 90 180 270 360];
value=[1 2 3 4];

In my case, length(angle)=73

How can I plot a disc in which the color of the radius line varies according to the vector value.

I would like something like imagesc but in a disc.

I unsuccessfully tried using rose, but it is limited to a max of 20 angles.

Answer 1

This is another alternative that does not use 3D graphics, only 2D. It uses the primitive patch command that draws triangles. Here is a result:

function PlotDisc
    thetas=(0:5:360)'*pi/180;
%     r=(0:0.1:1)';
    r = 1;
    [x,y]=pol2cart(thetas,r);
    colMap = GetColMap();
    for i=1:numel(x)-1
        X = [0 x(i) x(i+1) 0];
        Y = [0 y(i) y(i+1) 0];
        col = i / (numel(x)-1) * numel(colMap);
        patch(X,Y,col,'EdgeAlpha',0);
    end
    axis equal
end

function colMap = GetColMap()
   colMap = ...
   [0.0417         0         0
    0.0833         0         0
    0.1250         0         0
    0.1667         0         0
    0.2083         0         0
    0.2500         0         0
    0.2917         0         0
    0.3333         0         0
    0.3750         0         0
    0.4167         0         0
    0.4583         0         0
    0.5000         0         0
    0.5417         0         0
    0.5833         0         0
    0.6250         0         0
    0.6667         0         0
    0.7083         0         0
    0.7500         0         0
    0.7917         0         0
    0.8333         0         0
    0.8750         0         0
    0.9167         0         0
    0.9583         0         0
    1.0000         0         0
    1.0000    0.0417         0
    1.0000    0.0833         0
    1.0000    0.1250         0
    1.0000    0.1667         0
    1.0000    0.2083         0
    1.0000    0.2500         0
    1.0000    0.2917         0
    1.0000    0.3333         0
    1.0000    0.3750         0
    1.0000    0.4167         0
    1.0000    0.4583         0
    1.0000    0.5000         0
    1.0000    0.5417         0
    1.0000    0.5833         0
    1.0000    0.6250         0
    1.0000    0.6667         0
    1.0000    0.7083         0
    1.0000    0.7500         0
    1.0000    0.7917         0
    1.0000    0.8333         0
    1.0000    0.8750         0
    1.0000    0.9167         0
    1.0000    0.9583         0
    1.0000    1.0000         0
    1.0000    1.0000    0.0625
    1.0000    1.0000    0.1250
    1.0000    1.0000    0.1875
    1.0000    1.0000    0.2500
    1.0000    1.0000    0.3125
    1.0000    1.0000    0.3750
    1.0000    1.0000    0.4375
    1.0000    1.0000    0.5000
    1.0000    1.0000    0.5625
    1.0000    1.0000    0.6250
    1.0000    1.0000    0.6875
    1.0000    1.0000    0.7500
    1.0000    1.0000    0.8125
    1.0000    1.0000    0.8750
    1.0000    1.0000    0.9375
    1.0000    1.0000    1.0000] ;  

end