Size mismatch when i am using simulink

Greetings all, i am currently using simulink to do a project, however when i run the model the mismatch error has occured, below is the code an d details of the error:

Size mismatch (size [1 x 1] ~= size [2 x 10]). The size to the left is the size of the left-hand side of the assignment. Function 'MATLAB Function2' (#370.215.216), line 9, column 1: "u"

can anyone help me to fix this problem? many thanks!!!

function u  = fcn(x,y,K,P,u, Theta,Pstore)
for i=2:10
    h=[x(i-1);1];
    K=P*h*inv(h'*P*h+u);
    Theta(:,i)=Theta(:,i-1)+K*(y(i)-h'*Theta(:,i-1));
    P=(eye(2)-K*h')*P/u;
    Pstore(:,i-1)=[P(1,1),P(2,2)];
end
u=Theta;

Answer 1

[Jonas]

You have an input named 'u' and an output named 'u', with different sizes.

On line 9, the compiler thinks you are assigning the [2x10] matrix 'theta' to the [1x1] input 'u'.

Rename the output 'u'.

[Song Lyu]

How dumb am i...

Thank you!!