The condition number is the ratio of the largest to the smallest Eigen value of the Hessian matrix. If this number is very large, then the Hessian matrix is ill-conditioned. If this number is smaller than machine precision, the Hessian is numerically rank deficient as is 'indefinite'
hessian_condition_number(object, ...)A model object of class 'cmdlr'
Other arguments passed to the function