Microsoft Office Tutorials and References
In Depth Information
Using arrays
Table 12-3 contains examples of how Excel treats integers and decimal fractions longer than
15 digits when they are typed in cells with the default column width of 8.43 characters.
TABLE 12-3 Examples of numeric precision
Typed entry
Displayed value
Stored value
123456789012345678
1.23457E+17
123456789012345000
1.23456789012345678
1.234568
1.23456789012345
1234567890.12345678
1234567890
1234567890.12345
123456789012345.678
1.23457E+14
123456789012345
Excel can calculate positive values as large as 9.99E+307 and approximately as small as
1.00E–307. If a formula results in a value outside this range, Excel stores the number as text
and assigns a #NUM! error value to the formula cell.
Using arrays
Arrays are familiar concepts to computer programmers. Simply defined, an array is a
collection of items. Excel is one of the few applications that facilitate array operations, in which
items that are part of an array can be individually or collectively addressed in simple
mathematical terms. Here is some basic array terminology you should know:
An array formula acts on two or more sets of values, called array arguments , to return
either a single result or multiple results.
An array range is a block of cells that share a common array formula.
An array constant is a specially organized list of constant values you can use as
arguments in array formulas.
Arrays perform calculations in a way unlike anything else. You can use them for worksheet
security, alarm monitors, linear regression tables, and much more.
One-dimensional arrays
The easiest way to learn about arrays is to look at a few examples. For instance, you can
calculate the averages shown in Figure 12-32 by entering a single array formula.
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