double bound);
void lmm_update_variable_weight(lmm_system_t sys, lmm_variable_t var,
double weight);
+double lmm_get_variable_weight(lmm_system_t sys, lmm_variable_t var);
+
void lmm_update_constraint_bound(lmm_system_t sys, lmm_constraint_t cnst,
double bound);