Integrating 2nd order differential equation with ode45

2 views (last 30 days)
I'm trying to complete this assignment but I am having trouble with my code and I'm not sure why. Here is my assignment
Screen Shot 2018-12-09 at 12.33.03 AM.png
Here is my code I have written:
ti = 0;
tf = 10;
x0 = [1 0];
mass = 0;
b = 2.5;
k = 0;
for ii = 1:3
mass = mass + 1;
b = b-0.5;
k = k+2;
[time,position] = ode45(@(t_p2,x)odeMSD(t_p2,x,mass,b,k),[ti tf], x0);
figure(2), hold on
subplot(1,3,ii), hold on
plot(time,position(:,1), 'm') , plot(time,position(:,2), 'k')
legend('X Position (m)', 'Velocity (m/s)')
xlabel('Time (s)')
end
subplot(1,3,1)
title('1st Parameter')
subplot(1,3,2)
title('2nd Parameter')
subplot(1,3,3)
title('3rd Parameter')
hold off
function xde = odeMSD(t_p2,x,m,b,k)
xde = zeros(2,1);
xde(1) = x(1);
xde(3) = -(b./m).*x(2) - (k./m)*x(1);
end

Accepted Answer

madhan ravi
madhan ravi on 9 Dec 2018
xde(2) = -(b./m).*x(2) - (k./m)*x(1);
^----------should be 2 not 3!
  2 Comments
madhan ravi
madhan ravi on 9 Dec 2018
Anytime :) , yes it should be
x0 = [1 1];
^----should be 1

Sign in to comment.

More Answers (0)

Categories

Find more on Programming in Help Center and File Exchange

Products


Release

R2018a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!