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Part 3: The Excel Object Model
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Microsoft Office Excel 2003 Programming Inside Out can use a macro to do the work for you. The following CreateNames routine will build a named range for each of the time periods on the current worksheet and name it based on the name of the worksheet and the time period. The basic syntax is expression.Add(Name, RefersTo, Visible, MacroType, ShortcutKey, Category, NameLocal, RefersToLocal, CategoryLocal, RefersToR1C1, RefersToR1C1Local). Of the various parameters that are passed to the method, only four of them are of importance.
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A variant value that specifies the name that is to be given to the range.
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A variant value that specifies the cells to be included in the range using A1 notation. Required if RefersToR1C1 is not used. A variant value that specifies the cells to be included in the range using R1C1-style notation. Required if RefersTo is not used.
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RefersToR1C1 Visible
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An optional variant value that determines whether the Name is visible or not. Setting the property to True (the default) means the Name will appear in the Define Name, Paste Name, and Goto dialog boxes, while setting the property to False means the Name won t appear in those three dialog boxes (although you may still refer to the Name in formulas and VBA code).
Inside Out
Naming Ranges There are a few guidelines to follow when naming a range: A name must start with a letter or an underscore (_) character. The rest of the name can contain any combination of letters, digits, periods (.), or underscores. A name cannot be the same as an existing cell reference (B22, CB76, R2C20, and so on). A name cannot contain spaces or other special characters, curly braces, square brackets, or parentheses. A name cannot exceed 255 characters. Also, names over 253 characters are not selectable from the drop-down list. Names are not case sensitive. MyRange is the same as myrange. A name must be unique to workbook; you can t use the same name to refer to ranges on different worksheets.
The following sample macro, CreateNames, works by looping through each of the columns that contains entries based on time. On each pass of the loop, the name of the current worksheet and the label of the column being marked are used to generate the name of the range in the format MonthHourAMPM, as shown in Figure 8-6. (The 1:00 P.M. entries on the February worksheet would be named as February1PM.)
Part 3: The Excel Object Model
Ranges and Cells
Sub Dim Dim Dim Dim CreateNames()
strRangeName As String, strWorksheetName As String
intCounter As Integer, strRangeFormula As String
strColumn As String, strR1C1Formula As String
strA1Formula As String
For intCounter = 1 To 12 strWorksheetName = ActiveSheet.Name 'Calculate proper column name (D-O) by converting
'from R1C2 notation to A1 notation
strR1C1Formula = "R5C" & Format(intCounter + 3, "#0")
strA1Formula = Application.ConvertFormula(Formula:=strR1C1Formula, _
FromReferenceStyle:=xlR1C1, ToReferenceStyle:=xlA1) strRangeName = strWorksheetName & Format(Range(strA1Formula), "hAMPM") 'Format column portion of range formula
strColumn = "C" & Format(intCounter + 3, "#0")
strRangeFormula = "=" & strWorksheetName & "!R6" & _
strColumn & ":R36" & strColumn 'Add new range and continue ActiveWorkbook.Names.Add Name:=strRangeName, _ RefersToR1C1:=strRangeFormula Next intCounter End Sub
Figure 8-6.
This procedure creates names in the Y2001ByQuarter.xls workbook.
Changing Notation Styles
The CreateNames routine uses the ConvertFormula method of the Application object to facil itate the use of a counter to specify the column being referenced. Using a counter or any numeric variable to point to a specific column makes it very easy to move left or right among the columns. Using a value of 4 to point to column D, 6 can be added to point to column J or 2 can be subtracted to point to column B. However, the Range object will take cell pointers only by using the A1 style of notation or the Cells method. Rather than use the Cells method, the procedure takes advantage of the ConvertFormula method to build a reference in R1C1 notation and convert it to A1 notation. 179
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Part 3: The Excel Object Model
Microsoft Office Excel 2003 Programming Inside Out The ConvertFormula method also lets you convert from the A1 notation to the R1C1 nota tion. It will also allow you to change a formula s reference type from absolute to relative or vice versa. In the CreateNames routine, the ConvertFormula method converts a simple cell address from one reference type to another. As the name implies, you can pass a more complex formula for conversion, such as this example, which computes the daily average for the first two Mondays in January using the Y2001ByQuarters workbook.
strA1Formula = Application.ConvertFormula( _ Formula:=" =AVERAGE(R5C2:R5C13, _ R12C2:R12C13), fromReferenceStyle:=xlR1C1, _ toReferenceStyle:=xlA1)
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