How to create a time function and make a line rotate at a certain angular speed?

Hello! I have a question regarding my code I am trying to make an animation of a four bar linkage but in the end I need to plot theta_2 vs time. Angular speed should be 1 rad/sec, but I'm having trouble trying to wrap my head around the concept of time in MATLAB. How could I make the line rotate at a certain angular speed and how would I plot a graph of theta vs time? Any insight would be appreciated! Thanks!

r2_length = 2;
theta_2 = 0:0.1:2*pi;
y_r2 = r2_length * sin(theta_2);
x_r2 = r2_length * cos(theta_2);
origin = [0,0];

for i = 1:length(theta_2)
    r2 = line([origin(1) x_r2(i)], [origin(2) y_r2(i)],'linewidth', 2);
    hold on
    axis([-10 10, -10 10]);
    grid on
    pause(0.001);
    if i ~= length(theta_2)
        clf
    end
end

Answer 1

[Alan Stevens]

Do you mean something like this?

r2_length = 2;
tend = 10; % s
dt = 0.1;
t = 0:dt:tend;
omega = 1; % rad/s
theta = omega*t;
y_r2 = r2_length * sin(theta);
x_r2 = r2_length * cos(theta);
origin = [0,0];

for i = 1:length(theta)
    r2 = line([origin(1) x_r2(i)], [origin(2) y_r2(i)],'linewidth', 2);
    hold on
    axis([-5 5, -5 5]);
    grid on
    pause(0.001);
    if i ~= length(theta)
        clf
    end
end