Chapter 17: Introducing Array Formulas
In This Chapter
Defining arrays and array formulas
Comparing one-dimensional and two-dimensional arrays
Working with array constants
Working with array formulas
Looking at examples of multicell array formulas
Looking at examples of single-cell array formulas
One of Excel's most interesting (and most powerful) features is its ability to work with arrays in formulas. When you understand this concept, you'll be able to create elegant formulas that appear to perform spreadsheet magic.
This chapter introduces the concept of arrays and is required reading for anyone who wants to become a master of Excel formulas. Chapter 18 continues with lots of useful examples.
On the Web
Most of the examples in this chapter are available at this book's website. The filename is array examples.xlsx.
Understanding Array Formulas
If you do any computer programming, you've probably been exposed to the concept of an array. An array is a collection of items operated on collectively or individually. In Excel, an array can be one dimensional or two dimensional. These dimensions correspond to rows and columns. For example, a one-dimensional array can be stored in a range that consists of one row (a horizontal array) or one column (a vertical array). A two-dimensional array can be stored in a rectangular range of cells. Excel doesn't support three-dimensional arrays (but its VBA programming language does).
As you'll see, arrays don't have to be stored in cells. You ...
