Excel's Formula - sisman

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586 Part V: Miscellaneous <strong>Formula</strong> Techniques Here’s another example of a “precision” problem. Try entering the following formula: =(1.333–1.233)–(1.334–1.234) This formula should return 0, but it actually returns –2.220446E–16 (a number very close to zero). If that formula were in cell A1, the following formula would return the string “Not Zero”. =IF(A1=0,”Zero”,”Not Zero”) One way to handle these very-close-to-zero rounding errors is to use a formula like this: =IF(ABS(A1)
Chapter 21: Tools and Methods for Debugging <strong>Formula</strong>s 587 Logical value errors As you know, you can enter TRUE or FALSE into a cell to represent logical True or logical False. Although these values seem straightforward enough, Excel is inconsistent about how it treats TRUE and FALSE. Figure 21-6 shows a worksheet with three logical values in A1:A3 as well as three formulas that sum these logical values in A5:A6. As you see, these formulas return three different answers! Figure 21-6: This worksheet demonstrates an inconsistency when summing logical values. The formula in cell A5 uses the addition operator. The sum of these three cells is 2. The conclusion: Excel treats TRUE as 1, and FALSE as 0. But wait! The formula in cell A6 uses Excel’s SUM function. In this case, the sum of these three cells is 0. In other words, the SUM function ignores logical values. However, it’s possible to force these logical values to be treated as values by the SUM function by using an array formula. Enter the following formula using Ctrl+Shift+Enter, and it returns 2: =SUM(A1:A3*1) To add to the confusion, the SUM function does return the correct answer if the logical values are passed as literal arguments. The following formula returns 2: =SUM(TRUE,TRUE,FALSE) Although the VBA macro language is tightly integrated with Excel, sometimes it appears that the two applications don’t understand each other. I created a simple VBA function that adds the values in a range. The function (which follows), returns –2! Function VBASUM(rng) Dim cell As Range VBASUM = 0 For Each cell In rng VBASUM = VBASUM + cell.Value Next cell End Function
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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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Basic Information Chapter 1 Excel i
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Table 10-1: Excel Rounding Function
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770 Index array formulas (continued
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5. Limited Warranty. (a) WPI warran
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