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Visual Basic for Applications (VBA)

Visual Basic for Applications (VBA). An object-oriented programming language Instructions for the manipulation of objects A structured way to provide instructions to Excel Excel has an Object Library that defines its set of objects (e.g. workbooks, charts, ranges of cells). Logic of Language.

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Visual Basic for Applications (VBA)

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  1. Visual Basic for Applications (VBA) • An object-oriented programming language • Instructions for the manipulation of objects • A structured way to provide instructions to Excel • Excel has an Object Library that defines its set of objects (e.g. workbooks, charts, ranges of cells)

  2. Logic of Language • First part of a command identifies the object • Second part of command: • Sets a property of the object (e.g. color or font) • Takes an action on the object (e.g.copy or move) • Sets an attribute to the object (e.g. assigns a value to it using := )

  3. Example of an Instruction • Application.Workbooks(“Book1.xls”).Worksheets(“Sheet1”).Range(“A1”).Font.Name=“Arial” • Application.Workbooks(“Book1.xls”).Worksheets(“Sheet1”).Range(“A1”) is the object • Font.Name=“Arial” is the property being set

  4. Control of VBA • A Procedure is a set of instructions that operate on a set of objects • A Function is a procedure that returns a value as a result • A Subroutine is a procedure that can be run or used by another macro

  5. VBA Toolbar (Excel 2003)

  6. Developer Tab (Excel 2007)

  7. BlueCell Macro Sub bluecell() ' ' bluecell Macro ' With Selection.Interior .Pattern = xlSolid .PatternColorIndex = xlAutomatic .Color = 16777062 .TintAndShade = 0 .PatternTintAndShade = 0 End With End Sub

  8. Running Macros • Run Macro option • Shortcut Keys: [Ctrl][Shift] letter • Command Buttons • Custom Toolbar

  9. Running Solver through a Macro • Solver dialog box must have been opened at least once in current Excel session (i.e. Solver must be currently activated in Excel) • SolverSolveUserFinish:=True • Tools Reference option in VBA must have Solver selected • Other VBA commands for controlling Solver in class handout

  10. Debugging VBA Code • When VBA encounters a problem, it will highlight line in yellow. • Use [f8] key to step through code • Use the Reset icon button (square) at top of VBA to exit step-through mode and trouble- shoot code or Excel/VBA settings. Cannot retry macro until yellow highlight is gone.

  11. Plotting the Efficient Frontier – Version 1A Command Button Private Sub EfficientFrontier_Click() Range("C53") = Range("B59") SolverSolveUserFinish:=True Range("D59") = Range("C51") End Sub

  12. Plotting the Efficient Frontier – Version 1B Command Button Private Sub EfficientFrontier_Click() For unit = 1 To 11 Range("C53") = Range("B" & 58 + unit) SolverSolveUserFinish:=True Range("D" & 58 + unit) = Range("C51") Next unit End Sub

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