MATLAB: How to plot six concentric circles using meshgrid and plot

no questionplotting concentric circles

I am trying to plot six concentric circles using meshgrid() and plot(). The circles' radii vary between 0.5 and 1.75 (with intervals of 0.25). I am wondering whether the code below is sufficiently efficient and whether indeed it should be performed as delineated below:

theta = linspace(0, 2*pi, 50);
[X, Y] = meshgrid(0.5:0.25:1.75, theta);
plot(a+cos(Y).*X, b+sin(Y).*X);

Best Answer

You could conserve a little memory if you did it this way, but I don't know anyone who cares about efficiency for such a small plotting task,

theta = linspace(0, 2*pi, 50).';
R=0.5:0.25:1.75;
plot(a+cos(theta)*R, b+sin(theta)*R);

Related Solutions

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.

MATLAB: Plot circle with radius r and roughness amplitude e

Try this

r = 1; % radius
e = 0.15;
theta = linspace(0, 2*pi, 100);
R = r*ones(size(theta)) + (rand(size(theta))-0.5).*e/2;
x = R.*cos(theta);
y = R.*sin(theta);
plot(x, y, '.-');
axis([-r-0.5 r+0.5 -r-0.5 r+0.5])

Best Answer

Related Solutions

MATLAB: How to plot solid concentric circles in a meshgrid

MATLAB: Plot circle with radius r and roughness amplitude e

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