Make colored circle in polar plot

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JZ 2021-7-8

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https://ww2.mathworks.cn/matlabcentral/answers/874253-make-colored-circle-in-polar-plot

评论： Image Analyst 2021-7-12

Hi there, I need to make colored circle (with different values) in polar plot, looks like below. May anyone help me out? Thanks in advance.

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Answer 1

Image Analyst 2021-7-8

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https://ww2.mathworks.cn/matlabcentral/answers/874253-make-colored-circle-in-polar-plot#answer_742218

color_wheel.m

Maybe you can adapt the attached demo.

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JZ 2021-7-12

This is quite neat. Really appreciate that.

I am now thinking of make it simpler. But I prefer to set those color circles w/ different red or blue scaled by different values. Would you please help me out? Thanks!

Image Analyst 2021-7-12

在 MATLAB Online 中打开

I'd probably use scatter() where you can specify the color of each data point.

numSpots = 50;	% Whatever you want.
markerSize = 100;	% Whatever you want.
radius = 10;	% Whatever you want.
angles = linspace(20, 270, numSpots);	% Whatever starting and stopping angles you want.
x = radius * cosd(angles);
y = radius * sind(angles);
% Make up some colors for the data points, 
% like one that follows the jet colormap for example.
spotColors = jet(length(x));
% Plot dots in a scatter plot.
scatter(x, y, markerSize, spotColors, 'filled');
grid on;
xlabel('x', 'FontSize', 15);
ylabel('y', 'FontSize', 15);