MATLAB: How to create an animation that plots points on a circle

animationcircledecimalsMATLAB and Simulink Student Suiteplot

I want to create a circle where 0 degrees is 0 and 1 so that the circle ranges from 0-1. I then have a set of data points that are strictly decimals 0<=a<=1. I want an animation that plots these points around the circle in order so that I can watch them plot.

Best Answer

axes('NextPlot', 'add', 'XLim', [-1,1], 'YLim', [-1,1]);
for k = 1:100
  data = rand();  % A value between 0 and 1
  x    = cos(data * 2 * pi);
  y    = sin(data * 2 * pi);
  plot(x, y, 'o');
  pause(0.2);
end

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MATLAB: How to Assign an Axes Object to a struct

hAxes = axes('NextPlot', 'add', 'XLim', [0, 20], 'YLim', [-1, 10], 'Position', [0 0 0.5 0.5]);
h2Axes = axes('NextPlot', 'add', 'XLim', [0, 20], 'YLim', [-1, 10], 'Position', [0.5 0.5 0.5 0.5]);
W = 4;
Y = 0;
H = 8;
for i = 1 : 3
  X = i.* W;
  R = rectangle('Parent', hAxes);
  % Or:
  % R.Parent = hAxes;
  R.Position = [X Y W H];
  G(i).r = R;
end

MATLAB: How to plot solid concentric circles in a meshgrid

Try this:

theta = linspace(0, 2*pi, 100);
[X, Y] = meshgrid(1:1:4, theta);
a = 0;
b = 0;
figure(2)
plot(a+cos(Y).*X, b+sin(Y).*X);
axis([-1  1    -1  1]*6)
hold on
patch([xlim fliplr(xlim)], [min(ylim)*[1 1] max(ylim)*[1 1]], 'k')
for k1 = 4 : -1 : 1
    color = [1 1 1]*(mod(k1,2)==0);
    patch(a+cos(Y(:,k1)).*X(:,k1), b+sin(Y(:,k1)).*X(:,k1), color);
end
hold off
axis equal
axis tight

It creates patch objects going from the largest radius to the smallest, changing the colours with each iteration of the for loop. It colours the background black first. If you want a larger background, area, increase the multiplier (here 6) in the axis call.

Experiment to get the result you want.

Best Answer

Related Solutions

MATLAB: How to Assign an Axes Object to a struct

MATLAB: How to plot solid concentric circles in a meshgrid

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