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Simple pendulum simulation in matlab
error: without the hold off in line 33 we can\'t get the animation clearly https://www.youtube.com/watch?v=JbXtB-WIv38 clear all close all clc %input Parameters b = 0.2; g = 9.81; l = 1; m = 1; x0 = 0; y0 = 0; % initial condition theta_0 = [1 0]; %time points t_span = linspace(0,20,900); % solve ODE [t, results] = ode45(@(t,theta)…
Gokulkumar M
updated on 27 Dec 2019
error: without the hold off in line 33 we can\'t get the animation clearly
https://www.youtube.com/watch?v=JbXtB-WIv38
clear all
close all
clc
%input Parameters
b = 0.2;
g = 9.81;
l = 1;
m = 1;
x0 = 0;
y0 = 0;
% initial condition
theta_0 = [1 0];
%time points
t_span = linspace(0,20,900);
% solve ODE
[t, results] = ode45(@(t,theta) ode_func(theta,b,g,l,m), t_span, theta_0);
hold on
plot(t,[results(:,1) results(:,2)])
ylabel(\'plot\')
xlabel(\'time\')
theta = results(:,1);
ct = 1;
for i = 1:length(theta)
x = theta(i);
y1 = -l.*cos(x);
x1 = l*sin(x);
plot([x0 x1],[y0 y1],\'color\', \'b\');
hold on
hold off
axis([-1 1 -1 1]);
pause(0.01);
M(ct)= getframe(gcf);
ct=ct+1;
end
movie(M)
videofile = VideoWriter(\'two_arm_robot.avi\',\'Uncompressed AVI\');
open(videofile)
writeVideo(videofile,M)
close(videofile)function [dtheta_dt] = ode_func(theta,b,g,l,m)
theta1 =theta(1);
theta2 =theta(2);
dtheta1_dt = theta2;
dtheta2_dt = -(b/m)*theta2 -(g/l*sin(theta1));
dtheta_dt = [dtheta1_dt; dtheta2_dt];
end
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