Excel's Formula - sisman

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578 Part V: Miscellaneous Formula Techniques Formulas returning an error A formula may return any of the following error values: #DIV/0! #N/A #NAME? #NULL! #NUM! #REF! #VALUE! The following sections summarize possible problems that may cause these errors. Excel allows you to choose how error values are printed. To access this feature, display the Page Setup dialog box and click the Sheet tab. You can choose to print error values as displayed (the default), or as blank cells, dashes, or #N/A. To display the Page Setup dialog box, click the dialog box launcher in the Page Layout➜Page Setup group. #DIV/0! errors Division by zero is not a valid operation. If you create a formula that attempts to divide by zero, Excel displays its familiar #DIV/0! error value. Because Excel considers a blank cell to be zero, you also get this error if your formula divides by a missing value. This problem is common when you create formulas for data that you haven’t entered yet, as shown in Figure 21-2. The formula in cell D2, which was copied to the cells below it, is as follows: =(C2–B2)/C2 Tracing error values Often, an error in one cell is the result of an error in a precedent cell (a cell that is used by the formula). To help track down the source of an error value in a cell, select the cell and choose Formulas➜Formula Auditing➜Error Checking➜Trace Error. Excel draws arrows to indicate the error source. After you identify the error, use Formulas➜Formula Auditing➜Error Checking➜Remove Arrows to get rid of the arrow display.
Chapter 21: Tools and Methods for Debugging Formulas 579 Figure 21-2: #DIV/0! errors occur when the data in column C is missing. This formula calculates the percent change between the values in columns B and C. Data is not available for months beyond May, so the formula returns a #DIV/0! error. To avoid the error display, you can use an IF function to check for a blank cell in column C: =IF(C2=0,””,(C2–B2)/C2) This formula displays an empty string if cell C2 is blank or contains 0; otherwise, it displays the calculated value. Another approach is to use the IFERROR function to check for any error condition. The following formula, for example, displays an empty string if the formula results in any type of error: =IFERROR((C2–B2)/C2,””) IFERROR was introduced in Excel 2007. For compatibility with previous versions, use this formula: =IF(ISERROR((C2–B2)/C2),””,(C2–B2)/C2) #N/A errors The #N/A error occurs if any cell referenced by a formula displays #N/A. Some users like to enter =NA() or #N/A explicitly for missing data (that is, Not Available). This method makes it perfectly clear that the data is not available and hasn’t been deleted accidentally. The #N/A error also occurs when a lookup function (HLOOKUP, LOOKUP, MATCH, or VLOOKUP) can’t find a match.
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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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Working with Dates and Times In Thi
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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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About the SUBTOTAL function Chapter
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10 Miscellaneous Calculations In Th
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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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Performing Magic with Array Formula
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Appendixes Appendix A Excel Functio
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770 Index array formulas (continued
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788 Index
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5. Limited Warranty. (a) WPI warran
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