fixed_variable_treatment:
Determines how fixed variables should be handled.
The main difference between those options is that
the starting point in the "make_constraint" case
still has the fixed variables at their given
values, whereas in the case "make_parameter" the
functions are always evaluated with the fixed
values for those variables. Also, for
"relax_bounds", the fixing bound constraints are
relaxed (according to" bound_relax_factor").
For both "make_constraints" and "relax_bounds",
bound multipliers are computed for the fixed
variables.
The default value for this string option is "make_parameter".
Possible values:
- make_parameter: Remove fixed variable from optimization
variables
- make_constraint: Add equality constraints fixing variables
- relax_bounds: Relax fixing bound constraints
Andreas Waechter
2010-12-22