given x and y data points, I am trying to minimize the function shown in the image, but getting below error.

(upload://b29lLLjHTD1n7ohfGb90PIDqub4.jpeg)

Disciplined convex programming error:

Only scalar quadratic forms can be specified in CVX ![cvxprob1|344x84]

```
> cvx_begin
> variable x_c(1)
> variable y_c(1)
> variable r(1)
> variable z(3,1)
> variable A(50,3)
> variable b(50,1)
> z=[x_c ; y_c ; r];
> A=[x_c-2*x y_c-2*y -r*ones(50,1)];
> b=-((x.*x)+(y.*y));
> minimize ((norm(- b + A*z )))
> cvx_end
> t = linspace(0, 2*pi, 1000);
> plot(x, y, 'o', r*cos(t) + x_c, r*sin(t) + y_c, '-');
```

could you please suggest some help.