Matrix loop multiplication warning

Hello,

I have this code:

n=1;

Eout=zeros(4096,2);

while n<=4096

E=[Eopt(n); 0]; coupler=[sqrt(0.9) 1i*sqrt(0.1);1i*sqrt(0.1) sqrt(0.9)];

Eout(n)=coupler*E;

n=n+1;

end

I would like to have the various n results from Eout (a 2x1 matrix) in 4096x2 matrix. However, when i run this code this warning appears:

??? In an assignment A(I) = B, the number of elements in B and I must be the same.

Error in ==> Sim42 at 62

What should i do?

Thanks

Answer 1

[Adam]

Try:

Eout(n,:)=coupler*E;

though I can't tell if that is the only problem with the code you posted.

Which line is actually giving the error? Is it that line or the one above which also may be suspect depending what Eopt is.

[Joao]

Thanks!

Answer 2

[Star Strider]

You should add an extra dimension to the ‘Eout’ assignment:

Eopt = randi(100, 4096, 1);     % Create Data

n=1;

Eout=zeros(4096,2);

while n<=4096

E=[Eopt(n); 0]; 

coupler=[sqrt(0.9) 1i*sqrt(0.1);1i*sqrt(0.1) sqrt(0.9)];

Eout(n,:)=coupler*E;

n=n+1;

end

Then it works!

[Joao]

Thanks!

[Star Strider]

My pleasure!