Excel's Formula - sisman

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542 Part V: Miscellaneous Formula Techniques Part VI provides an overview of VBA, with specific information about creating custom worksheet functions. The companion CD-ROM contains all the examples in this section. The file is named conditional formatting with VBA functions.xlsm. Identifying formula cells Oddly, Excel does not have a function that determines whether a cell contains a formula. When Excel lacks a feature, you often can overcome the limitation by using VBA. The following custom VBA function uses the VBA HasFormula property. The function, which you can enter into a VBA module, returns TRUE if the cell (specified as its argument) contains a formula; otherwise, it returns FALSE. Function CELLHASFORMULA(cell) As Boolean CELLHASFORMULA = cell.HasFormula End Function After you enter this function into a VBA module, you can use the function in your worksheet formulas. For example, the following formula returns TRUE if cell A1 contains a formula: =CELLHASFORMULA(A1) And you also can use this function in a conditional formatting formula. The worksheet in Figure 19-23, for example, uses conditional formatting to identify cells that contain a formula. In this case, formula cells are displayed in bold, with a background color. Another way to identify formula cells is to choose Home➜Editing➜Find & Select➜Go To Special, which displays the Go To Special dialog box. Choose the Formulas option and click OK to select all cells that contain a formula. Identifying date cells Excel also lacks a function to determine whether a cell contains a date. The following VBA function, which uses the VBA IsDate function, overcomes this limitation. The custom CELLHASDATE function returns TRUE if the cell contains a date. Function CELLHASDATE(cell) As Boolean CELLHASDATE = IsDate(cell) End Function
Chapter 19: Conditional Formatting and Data Validation 543 Figure 19-23: Using a custom VBA function to apply conditional formatting to cells that contain a formula. The following conditional formatting formula applies formatting to cell A1 if it contains a date and the month is June: =AND(CELLHASDATE(A1),MONTH(A1)=6) The following conditional formatting formula applies formatting to cell A1 if it contains a date and the date falls on a weekend: =AND(CELLHASDATE(A1),OR(WEEKDAY(A1)=7,WEEKDAY(A1)=1)) Identifying invalid data You might have a situation in which the data entered must adhere to some very specific rules, and you’d like to apply special formatting if the data entered is not valid. For example, consider part numbers that consist of seven characters: four uppercase alphabetic characters, followed by a hyphen, and then a two-digit number — for example, ADSS-09 or DYUU-43. You can write a conditional formatting formula to determine whether part numbers adhere to this structure, but the formula is very complex. The following formula, for example, returns TRUE only if the value in A1 meets the part number rules specified:
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Excel ® Microsoft 2010 ® Microsof
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Excel® 2010 Formulas Published by
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Publisher’s Acknowledgments We’
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vi Part VII: Appendixes Appendix A:
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viii Keyboard shortcuts . . . . . .
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x Potential Problems with Names . .
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xii Date-Related Functions . . . .
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xiv Working with Tables . . . . . .
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xvi Chapter 13: Financial Schedules
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xviii Creating Links to Cells . . .
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xx Excel’s Auditing Tools . . . .
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xxii Does the text match a pattern?
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1 INTRODUCTION Welcome to Excel 201
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VBA code listings Introduction 3 Do
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Introduction 7 You can also use thi
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Basic Information Chapter 1 Excel i
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Introducing Worksheet Functions In
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Let Excel insert functions for you
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Manipulating Text In This Chapter
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Working with Dates and Times In Thi
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Figure 6-10: This worksheet convert
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Getting a quick count or sum Chapte
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Yet another way to perform this cou
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Figure 7-14 shows this formula at w
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The following array formula does th
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About the SUBTOTAL function Chapter
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10 Miscellaneous Calculations In Th
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Need to convert other units? Solvin
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Table 10-1: Excel Rounding Function
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Round it up to the nearest penny.
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Introducing Arrays In This Chapter
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Chapter 14: Introducing Arrays 369
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Figure 14-4: Creating a named array
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Figure 14-7: Creating an array from
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Performing Magic with Array Formula
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Introducing VBA In This Chapter ●
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Figure 22-2: The Macro Settings sec
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Introducing the Visual Basic Editor
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Immediate window Chapter 22: Introd
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Storing VBA code In general, a modu
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Function Procedure Basics In This C
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Figure 23-1: A simple VBA function
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3. Type the name of your function i
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x = 1 InterestRate = 0.0625 LoanPay
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The Count property Chapter 24: VBA
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A Multifunctional Function Chapter
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Worksheet function data types Gener
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For i = 2 To TextLen If Mid(text, i
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Function WORDCOUNT(rng As Range) As
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Multisheet Functions Chapter 25: VB
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Function RANGERANDOMIZE(rng) Dim V(
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Appendixes Appendix A Excel Functio
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770 Index array formulas (continued
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784 Index tables (continued) rows,
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786 Index VBA (continued) data type
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788 Index
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5. Limited Warranty. (a) WPI warran
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COMPUTERS/Spreadsheets $49.99 US $5
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