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Part 1: Preliminaries
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Microsoft Office Excel 2003 Programming Inside Out Tip
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Limit the number of worksheets to one If you plan to create a lot of templates, which requires saving a workbook that contains a single worksheet, you could save a few steps by changing the default number of worksheets to one until you are done creating templates.
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You navigate among worksheets in a workbook using the controls on the tab bar at the bot tom left corner of the Excel window. Each worksheet has its own sheet tab (named Sheet1, Sheet2, and Sheet3 by default); clicking a sheet tab displays the corresponding sheet, while right-clicking a sheet tab displays a shortcut menu with commands to insert a new sheet, rename or delete the selected sheet, move or copy sheets, or change the color of the sheet tab of the selected sheet. The ability to change the color of a sheet tab was introduced in Excel 2002 and is a handy technique you can use to indicate where you made changes in a workbook, emphasize one sheet over another (such as if you create a summary worksheet), and facilitate workbook navigation. Important
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One little-known limitation in Excel is that you may use up to only 56 colors in a workbook. The limitation doesn t include the colors depicted in graphics you embed or link to in a workbook, so if you need to display a complex chart with more than 56 colors you will need to create the chart, export the chart and its legend to a graphics program, edit the chart and legend, and either display the chart and legend as a separate graphics file or embed the new file in your workbook.
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Worksheets
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Of the four basic types of sheets you ll work with in Excel, worksheets are by far the most com mon. Worksheets contain cells, which are arranged in rows and columns, where you store data and create formulas to summarize that data. As noted in Table 2-1, Excel worksheets have a maximum of 256 columns and 65,536 rows. If you re working with larger data sets, such as those generated by scientific experiments or a transaction tracking system in a busy sales organization, you should probably write the data to a text file and either process it in man ageable chunks or use a more powerful, enterprise-worthy application to analyze the data.
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Table 2-1.
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Excel Worksheets Can Hold a Lot of Data but Have Their Limits
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Limit
65,536 256 255 characters 409 points 1000
Attribute
Maximum rows Maximum columns Column width Row height Maximum number of page breaks
Part 1: Preliminaries
Exploring Excel
Table 2-1.
Excel Worksheets Can Hold a Lot of Data but Have Their Limits
Limit
No maximum, but only 251 will be displayed in a scenario summary 200
Attribute
Maximum number of scenarios
Maximum number of changing cells in a scenario 32 Maximum number of changing cells in Solver
One of the most underused capabilities in Excel is the scenario, which lets you define alterna tive data sets for a worksheet. As noted in Table 2-1, each scenario can contain up to 32 changes. The advantages of scenarios are that you can define them quickly (by clicking Tools, Scenarios and using the controls in the Scenario Manager dialog box, shown in Figure 2-1), and you re able to switch between alternative data sets without having to create a new worksheet to contain the speculative data. If you re creating one new worksheet that contains 12 values, 3 of which change, scenarios probably won t save you that much time. However, if you have a broad range of values (and combinations of values) that could change and you don t want to keep track of separate worksheets for each possible combination, you can create a scenario for each combination and switch within the same worksheet.
Figure 2-1. data sets.
The Scenario Manager dialog box helps you manage and present alternative
If you need to create a scenario with more than 32 changes, you should probably ceate a new worksheet to hold the data.
Cells and Ranges
At the bottom of the organizational hierarchy in Excel is the cell, which is formed by the intersection of a column and a row in a worksheet. A cell can contain a value or a formula. By default, Excel displays the result of a formula in its cell, but you can change that setting by clicking Tools, Options, clicking the View tab, and selecting Formulas. What s interesting is 15
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