+ int id_int;
+ /* \begin{For Lagrange only} */
+ double mu;
+ double new_mu;
+ 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} */
+ /* \end{For Lagrange only} */