Changes an existing constraint. Equivalent to clicking Solver on the Tools menu and then clicking Change in the Solver Parameters dialog box.
Before you use this function, you must establish a reference to the Solver add-in. With a Visual Basic module active, click References on the Tools menu, and then select the Solver.xla check box under Available References. If Solver.xla doesn't appear under Available References, click Browse and open Solver.xla in the \Office\Library subfolder.
SolverChange(CellRef, Relation, FormulaText)
CellRef Required Variant. A reference to a cell or a range of cells that forms the left side of a constraint.
Relation Required Integer. The arithmetic relationship between the left and right sides of the constraint. If you choose 4 or 5 , CellRef must refer to adjustable (changing) cells, and FormulaText shouldn’t be specified.
| Relation | Arithmetic relationship |
|---|---|
| 1 | <= |
| 2 | = |
| 3 | >= |
| 4 | Cells referenced by CellRef must have final values that are integers. |
| 5 | Cells referenced by CellRef must have final values of either 0 (zero) or 1. |
FormulaText Optional Variant. The right side of the constraint.
If CellRef and Relation don't match an existing constraint, you must use the SolverDelete and SolverAdd functions to change the constraint.
This example loads the previously calculated Solver model stored on Sheet1, changes one of the constraints, and then solves the model again.
Worksheets("Sheet1").Activate
SolverLoad loadArea:=Range("A33:A38")
SolverChange cellRef:=Range("F4:F6"), _
relation:=1, _
formulaText:=200
SolverSolve userFinish:=False