/* \begin{For Lagrange only} */
double mu;
double new_mu;
- double df; /* Total delay of flow */
double (* func_f) (struct lmm_variable *var, double x); /* (f) */
double (* func_fp) (struct lmm_variable *var, double x); /* (f') */
double (* func_fpi) (struct lmm_variable *var, double x); /* (f')^{-1} */