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• Optimization Inputs: Constraint

Overview of DiscoverSim™ Menu and Dialogs

Optimization Inputs: Constraint

1. A constraint can be applied to an Input Control or DSIM Function but cannot directly reference a stochastic (statistical) Input Distribution or stochastic Output Response.


2. Each constraint will contain a function of Input Controls on the Left Hand Side (LHS), and a constant on the Right Hand Side (RHS). The LHS can be simple linear or complex nonlinear.
   
   
3. A constraint formula or cell reference is specified in the LHS. You can manually enter a simple formula in the LHS box, or click the cell reference and specify a cell containing the constraint formula. After specifying a cell reference, the dropdown symbol changes from to .


4. You can manually enter a constant in the RHS box, or click the cell reference and specify a cell containing the constraint. Note that the RHS value must be a fixed constant. After specifying a cell reference, the dropdown symbol changes from to .


5. Select the comparison operator: <, <=, =, >=, >.


• • Note that optimization is much harder with equality constraints than with inequality constraints.
• • The equality tolerance can be set in Optimization > Advanced Options (default = 0.001, i.e. the equality constraint is satisfied if LHS is within +/- 0.001 of RHS).


6. Constraint Number is provided for reference purposes only.


7. Constraint Name is the cell address by default. Enter a name to describe the constraint.


8. Constraint cell color can be modified by clicking on Cell Address (default colors can be changed in Help > DiscoverSim Options).