when I try to solve the following problem I get the error

cvx_begin

variable v(50)

minimize(square_pos(norm(A1-v*v.’,‘Fro’))-norm(v,2))

%minimize(sum_{i,j=1}^{50} sum_square(A1(i,j)-v(i)*v(j))-sum_square(v(i)*v(i))

cvx_end

Error using * (line 126)

Disciplined convex programming error:

Only scalar quadratic forms can be specified in CVX

Any Ideas how to solve?

Thanks