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Chapter 8. Working with Logical and Info... > Adding Intelligence with Logical Fun...

Adding Intelligence with Logical Functions

In the computer world, we very loosely define something as intelligent if it can perform tests on its environment and act in accordance with the results of those tests. However, computers are binary beasts, so “acting in accordance with the results of a test” means that the machine can do only one of two things. Still, even with this limited range of options, you'll be amazed at how much intelligence you can bring to your worksheets. Your formulas will actually be able to test the values in cells and ranges, and then return results based on those tests.

This is all done with Excel's logical functions, which are designed to create decision-making formulas. For example, you can test cell contents to see whether they're numbers or labels, or you can test formula results for errors. Table 8.1 summarizes Excel's logical functions.


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