Here x is a column vector,

lambda is a diagonal matrix,

A is a weight matrix to be generated randomly;

C is a column constant vector,

E is a unit column vector,

I have uploaded the main update equation image and the required formula expansions for the same.

The issue comes when I write the objective as it shows error of the type : Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error. To construct matrices, use brackets instead of parentheses.

My code is as follows:

```
function [x,f_opt] = follower_update(lambda,rho,E,A,C)
rho = 2;
E = eye(6,1);
Z = [1 2 1 4 2 1];
lambda = diag(Z,0);
A = rand(6,1);
C = rand(1,1);
cvx_begin
variable x(6,1) nonnegative;
minimize x'*x - [lambda*E]'*A'*x + exp(x) + (rho/2) * power(2,(norm(sum A'*x + A'*x + sum A'*x - C),2));
cvx_end
f_opt = cvx_optval;
```

In my solution function fi(xi) = xi^2 and hi(xi)= exp(xi) and I have not included theta for now. Please help me with this error .

Thanks!