Changes an existing constraint. Equivalent to clicking Solver in the Data | Analyze group and then clicking Change in the Solver Parameters dialog box.
The Solver add-in is not enabled by default. Before you can use this function, the Solver add-in must be enabled and installed. After the Solver add-in is installed, you must establish a reference to the Solver add-in. For information about how to do that, see Before Using The Solver VBA Functions.
Syntax
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 should not 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. |
| 6 | Cells referenced by CellRef must have final values that are all different and integers. |
FormulaText Optional Variant. The right side of the constraint.
Remarks
If CellRef and Relation don't match an existing constraint, you must use the SolverDelete and SolverAdd functions to change the constraint.
Example
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("C4:E6"), relation:=3, formulaText:=1
SolverSolve userFinish:=False