MATLAB: Displaying the radius on the plot

Question

HI everyone i have 2 cocentric circle which are of radius 1.5 and rafius 2 . i just want to be able to display the radius on to the plot once simulated . How do i do dat ?

Thank you

Answer 1

I am not quite certain what you want.

The Code —

t = linspace(0, 2*pi);
r = [1.5; 2];                                           % Radius
ctr = [0.5; 0.2];                                       % Circle Center
x = [r*cos(t) + ctr(1)]';
y = [r*sin(t) + ctr(2)]';
figure
plot(x, y)
hold on
plot([1 1]*ctr(1), [1 1]*ctr(2),'+r')                    % Plot Center
plot([ctr(1) x(20,1)], [ctr(2) y(20,1)],'-b')
plot([ctr(1) x(40,2)], [ctr(2) y(40,2)],'-r')
hold off
axis equal
axis([ -3  3    -3  3])
text(x(20,1), y(20,1), '$R\ =\ 1.5$','Interpreter','latex')
text(x(40,2), y(40,2), '$R\ =\ 2.0$','Interpreter','latex')

The Plot —

This draws the radii and labels them.

Experiment to get the result you want.