How to create animation ?

I have written a code to solve differential equation of a simple pendulum. I tried creating animation of the same. But I am not getting properly. Please correct me.

clear all
close all
clc
%let theeta=y
L=1;
t=[0 20];
yo=[0 3];
[t,y]=ode45('simplependulum',t,yo)

figure(1)
plot(t,y(:,1))
xlabel('time')
ylabel('displacement')
figure(2)
plot(t,y(:,2))
xlabel('time')
ylabel('angular velocity')

O=[0 0];
axis(gca,'equal');
axis([-0.7 0.7 -0.7 0.2]);
grid on;
figure(3)

for i=1:length(t)
    P=L*[sin(y(i,1)) -cos(y(i,1))]
    O_circle=viscircles(O,0.01);
    pend=line([O(1) P(1)],[O(2) P(2)]);
    ball=viscircles(P,0.05);
    pause(0.001);
    if i<length(t)
        delete(pend);
        delete(ball);
        delete(O_circle);
    end
end

Answer 1

[Image Analyst]

See attached demo where I make a movie from different frames of surf() - the surface is changing in time.