Excel's Formula - sisman

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378 Part IV: Array Formulas 3. Press Ctrl+Enter. This step enters an identical (non-array) formula into each selected cell. 4. Change your range selection to include additional or fewer cells. 5. Press F2 to reenter edit mode. 6. Press Ctrl+Shift+Enter. Using Multicell Array Formulas This section contains examples that demonstrate additional features of multicell array formulas (array formulas that are entered into a range of cells). These features include creating arrays from values, performing operations, using functions, transposing arrays, and generating consecutive integers. Creating an array from values in a range The following array formula creates an array from a range of cells. Figure 14-7 shows a workbook with some data entered into A1:C4. The range D8:F11 contains a single array formula: {=A1:C4} Array formulas: The downside If you’ve read straight through to this point in the chapter, you probably understand some of the advantages of using array formulas. The main advantage, of course, is that an array formula enables you to perform otherwise impossible calculations. As you gain more experience with arrays, you undoubtedly will discover some disadvantages. Array formulas are one of the least understood features of Excel. Consequently, if you plan to share a workbook with someone who may need to make modifications, you should probably avoid using array formulas. Encountering an array formula when you don’t know what it is can be very confusing. You might also discover that you can easily forget to enter an array formula by pressing Ctrl+Shift+Enter. If you edit an existing array, you still must use these keys to complete the edits. Except for logical errors, this is probably the most common problem that users have with array formulas. If you press Enter by mistake after editing an array formula, just press F2 to get back into edit mode and then press Ctrl+Shift+Enter. Another potential problem with array formulas is that they can sometimes slow your worksheet’s recalculations, especially if you use very large arrays. On a faster system, this may not be a problem. But, conversely, using an array formula is almost always faster than using a custom VBA function. (Part VI of this book covers custom VBA functions.)
Figure 14-7: Creating an array from a range. Chapter 14: Introducing Arrays 379 The array in D8:F11 is linked to the range A1:C4. Change any value in A1:C4, and the corresponding cell in D8:F11 reflects that change. Creating an array constant from values in a range In the previous example, the array formula in D8:F11 essentially created a link to the cells in A1:C4. It’s possible to sever this link and create an array constant made up of the values in A1:C4. To do so, select the cells that contain the array formula (the range D8:F11, in this example). Then press F2 to edit the array formula. Press F9 to convert the cell references to values. Press Ctrl+Shift+Enter to reenter the array formula (which now uses an array constant). The array constant is as follows: {1,”dog”,3;4,5,”cat”;7,FALSE,9;”monkey”,8,12} Figure 14-8 shows how this looks in the Formula bar. Figure 14-8: After you press F9, the Formula bar displays the array constant. Performing operations on an array So far, most of the examples in this chapter simply entered arrays into ranges. The following array formula creates a rectangular array and multiplies each array element by 2:
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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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Table 10-1: Excel Rounding Function
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Round it up to the nearest penny.
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Appendixes Appendix A Excel Functio
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768 Part VII: Appendixes Turn off
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770 Index array formulas (continued
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772 Index CONVERT function, 275-277
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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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