Duffing Oscillator issue. "Keep getting Unable to perform assignment because the left and right sides have a different number of elements."
2 views (last 30 days)
Show older comments
The Duffing Oscillator is as follows:

To do this, we have to use the Euler-Cromer method to solve, which follows the following syntax:

and

My code is as follows:
clc;
T=10;
N=1000;
deltat=T/N;
omega=1.2;
alpha=1.5;
beta=0;
delta=0;
gamma=0;
x=[N 1];
y=[N 1];
t=[N 1];
x(1)=0;
y(1)=0;
x2=[N 1];
y2=[N 1];
x2(1)=x(1);
y2(1)=y(1);
t(1)=0;
for n=1:N
x(n+1)=x(n)+y(n)*deltat;
y(n+1)=y(n)+deltat*(gamma*cos(omega*t)-delta*x(n)-alpha*x(n+1)-beta*x(n+1).^3);
x2(n+1)=x2(n)+y2(n)*deltat;
y2(n+1)=y2(n)-k*y2(n)*deltat-(omega^2)*cos(x2(n+1))*deltat;
t(n+1)=t(n)+deltat;
end
figure(1)
plot(t,x);
hold on;
plot(x,y);
I just keep getting "Unable to perform assignment because the left and right sides have a
different number of elements." For the line which I went ahead and bolded
I've never used the Euler-Cromer method before, so maybe I'm doing something wrong, but honestly am not sure. Help would be much appreciated!
0 Comments
Answers (1)
James Tursa
on 19 Nov 2019
t is a vector, so your cos(omega*t) is a vector. You need to use cos(omega*t(n)) there.
0 Comments
See Also
Categories
Find more on Number Theory in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!