MATLAB: Plotting Van Der Pol

ode15plotvanderpol

Hello, I just have a simple question. I have a Van der Pol equation, which I want to plot:

[t,y] = ode15s(@vdp1000,[0 3000],[2 0]);

plot(t,y(:,1),'r-o')

My question is what is the meaning of the (:,1) in the plot function? I could not find any answers in the documentation or on this website. Thank you in advance

Best Answer

The ‘y(:,1)’ references the first column of the ‘y’ matrix returned by ode15s.

Related Solutions

MATLAB: Generalized Forced Van Der Pol Oscillator Phase Plot

Try this:

function [t,y] = VanderPol(idis, ivel, mu, A, omega)
[t,y] = ode23(@vdp1,[0 20],[2; 0]);
plot(t,y(:,1),'-o',t,y(:,2),'-o')
title('Solution of van der Pol Equation (\mu = 1) with ODE23');
xlabel('Time t');
ylabel('Solution y');
legend('y_1','y_2')
figure
plot(y(:,1),y(:,2))
title('Phase plane plot')
function dydt = vdp1(t,y)
dydt = [y(2); mu*(1-y(1)^2)*y(2)-y(1)+A*sin(omega*t)];
end
end

Then to call it:

idis = 2;
ivel = 0;
A = 8;
omega = 4;
mu = 3;
[t,y] = VanderPol(idis, ivel, mu, A, omega);
figure
plot(t,y)
grid

I added a tweak so that you can get the integrated results from your funciton. It is otherwise what you wrote.

MATLAB: GPU programming

Shabab, as far as I know MATLAB requires an NVIDIA GPU with a compute capability of 1.3 or higher. It is because MATLAB uses the CUDA in GPU's and those are available only on NVIDIA devices.

More information is can be found at : http://www.mathworks.com/discovery/matlab-gpu.html

Best Answer

Related Solutions

MATLAB: Generalized Forced Van Der Pol Oscillator Phase Plot

MATLAB: GPU programming

Related Question