Fixed variable handling

Type : Selection

Range : The settings listed below

Default : Convert to parameter

This option determines how fixed variables should be handled. Possible values are:

• Convert to parameter

• Add equality constraints

• Relax fixing bound constraints

The main difference between the possible settings is that the starting point in the ‘Add equality constraints’ case still has the fixed variables at their given values, whereas in the case ‘Convert to parameter’ the functions are always evaluated with the fixed values for those variables. Also, for Relax fixing bound constraints’, the fixing bound constraints are relaxed (according to the value of option**Factor for Initial Bounds Relaxation** ). For both ‘Add equality constraints’ and ‘Relax fixing bound constraints’, bound multipliers are computed for the fixed variables.

Learn more about

• Factor for initial bounds relaxation