XL: Using Solver.Ok from VBA Requires R1C1 Style Referencing

• Microsoft Excel 97 for Windows
• Microsoft Excel for Windows 95, versions 7.0, 7.0a
• Microsoft Excel for Windows, versions 5.0, 5.0c
• Microsoft Excel 98 Macintosh Edition
• Microsoft Excel for the Macintosh, versions 5.0, 5.0a

SUMMARY

When you call the Solver.Ok macro function from a Visual Basic for Applications procedure or macro, you need to use R1C1 notation when referencing cell ranges on a worksheet. If you use A1 notation in referencing cell ranges, you may receive the following error message:

   Run-Time Error 1004: Error in Formula

MORE INFORMATION

Microsoft provides programming examples for illustration only, without warranty either expressed or implied, including, but not limited to, the implied warranties of merchantability and/or fitness for a particular purpose. This article assumes that you are familiar with the programming language being demonstrated and the tools used to create and debug procedures. Microsoft support engineers can help explain the functionality of a particular procedure, but they will not modify these examples to provide added functionality or construct procedures to meet your specific needs. If you have limited programming experience, you may want to contact the Microsoft fee-based consulting line at (800) 936-5200. For more information about the support options available from Microsoft, please see the following page on the World Wide Web:

   http://www.microsoft.com/support/supportnet/refguide/default.asp

Before you use this function, you need to load the Solver Add-In using the Add-In manager. To load the Solver Add-In, follow these steps:

1. On the Tools Menu, click Add-Ins and click to select the Solver Add-In check box.

2. If the Solver Add-In doesn't appear in the Add-Ins Available box, click the Browse button, select Solver.xla in the \Excel\Library\Solver folder, and then click OK.

Sample Visual Basic Procedure

The following macro shows an example of how to call the Solver.Ok macro using R1C1 notation:

1. In a new Microsoft Excel Workbook, on the Insert menu, point to Macro, click Module, and then type the following macro code:

         Sub SolverOkDemo()
          Sheets("Sheet1").Select
          Range("C1").Select
          ActiveCell.Formula = "=a1+b1"
          ' Solve.Ok Parameters
          Set_Cell = Range("C1").Address(True, True, xlR1C1, True)
          Max_Min_Val = 3
          Value_Of = 21
          By_Changing = Range("a1:b1").Address(True, True, xlR1C1, True)
   
          Application.ExecuteExcel4Macro
          String:="'[SOLVER.XLA]SOLVER'!SOLVER.OK(" _
             & Set_Cell & "," & Max_Min_Val & "," & Value_Of & "," &
             By_Changing & ")"
          Application.ExecuteExcel4Macro
          String:="'[SOLVER.XLA]SOLVER'!SOLVER.SOLVE()"
         End Sub
   
   

2. On the Tools Menu, click Macro, select the SolverOkDemo Macro from the list, and then click the Run Button to run the macro.

1. Select sheet1.

2. Select cell C1.

3. Insert the formula =A1+B1 in cell C1.

4. Places the found solution in Cells A1 and B1.

5. Solver's dialog box will appear, indicating that it found a solution.

REFERENCES

For more information about SolverOk in Microsoft Excel version 7.0, click Answer Wizard on the Help menu and type:

   SolverOk

   Solver.ok

   ARTICLE-ID: Q163435
   TITLE     : VBA: Programming Resources for Visual Basic for
               Applications