MATLAB: Matrix dimensions must agree error

matrix dimensions

I'm having matrix dimensions must agree error

Screen Shot 2019-10-29 at 10.47.36 PM.png

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Well, tau is only two elements and w is a lot more than that, so you can't multiply them element-wise like you are attempting to do. Maybe you wanted to use tau(t) inside your for-loop instead of tau? And for plotting, maybe just x instead of x(w)?

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MATLAB: Please solve the error am new one to matlab..!!

Clearly tau and eta don't have the same number of columns (or alpha or beta are column vectors with different length).

We can't fix that for you. The matrix dimensions must agree for matlab to work out the answer.

MATLAB: Convolution integral with ode45

Try this:

odefcn = @(t,y,c,F,k,m,w) [y(2); -(k.*y(1) - F.*cos(t.*w) + integral(@(tau)c(t - tau).*y(2).*tau, 0, t))./m];
c = @(t) exp(-t.^2);                                                                    % Make Something Up
[F,k,m,w] = deal(rand,rand,rand,rand);                                                  % Replace With Correct Values
tspan = [0 10];
ics = [1; 1];
[t,y] = ode45(@(t,y)odefcn(t,y,c,F,k,m,w), tspan, ics);
figure
plot(t, y)
hl = legend('$u(t)$', '$\dot{u}(t)$');
set(hl,'Interpreter','latex')

Noite that ‘c’ actually has to be defined as a function in order for this to work. Supply the correct one.

I derived it with the help of the Symbolic Math Toolbox.

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MATLAB: Please solve the error am new one to matlab..!!

MATLAB: Convolution integral with ode45

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