Unable to perform assignment because the size of the left side is 2-by-1 and the size of the right side is 2-by-2.

clear all;

n = 2;

G = [2,-1;-1,2];

C = [1,0;0,1];

B = [1,0];

nd = 2;T = 10;N = 10000;

Vo = zeros(n,1);

dt = T/N;

dt1 = T/(N-1);

t(1) = 0;

for i=2:N

t(i)=(i-1)*dt1;

end

for i=1:N

Vin(i)=sin(10*t(i));

end

V(:,1) = Vo;

for i=2:N

V(:,i)=((C+G*dt))\(C*V(:,i-1)+B*Vin(i)*dt);

end

plot(t,V(nd,:));

[ME]

I think some more info might be needed here.

MATLAB is correct in that your V(:,i) is going to be 2x1 and the ((C+G*dt))\(C*V(:,i-1)+B*Vin(i)*dt) is 2x2. What is it that you actually want to happen here?

Answer 1

[Mahesh Taparia]

Hi Mahmoud,

As per your code,

1. V is a vector of 2X1,
2. C and G are matrix of 2X2,
3. B is a row vector of 1X2,
4. dt is a scalar.

In the expression, the computation of ‘(C*V(:,i-1)+B*Vin(i)*dt)’ is not possible as per matrix multiplication rule. Also, ‘(C+G*dt)’ will gives a 2X2 matrix and left side of equation is a vector of 2X1 dimension which is inconsistent. Check the expression or the value of the matrices you have defined.