How to incorporate the Matlab code 'eig' in CVX

The funtion is :

minimize( norm(eig(Jacobi)-lambda)+norm(eig(subJacobi)-mu)),

where Jacobi and subJacobi is unkown matrix.
operating the CVX toolbox

??? Undefined function or method 'eig' for input arguments of type 'cvx'.

It cannot be done. Please read the first section of the users guide very carefully; it should be evident why this is not possible.