Microsoft Office Tutorials and References

In Depth Information

**Chapter 15: Performing Magic with Array Formulas**

Summing the
n largest values in a range

The following array formula returns the sum of the 10 largest values in a range named
Data
:

{=SUM(LARGE(Data,ROW(INDIRECT(“1:10”))))}

The LARGE function is evaluated 10 times, each time with a different second argument (1, 2, 3,

and so on up to 10). The results of these calculations are stored in a new array, and that array is

used as the argument for the SUM function.

To sum a different number of values, replace the 10 in the argument for the INDIRECT function

with another value.

If the number of cells to sum is contained in cell C17, use the following array formula, which uses

the concatenation operator (&) to create the range address for the INDIRECT function:

{=SUM(LARGE(Data,ROW(INDIRECT(“1:”&C17))))}

To sum the
n
smallest
values in a range, use the SMALL function instead of the LARGE function.

Computing an average that excludes zeros

Figure 15-2 shows a simple worksheet that calculates average sales. The formula in cell B13 is

=AVERAGE(B4:B11)

Figure 15-2:
The calculated average includes cells that contain a 0.

Two of the sales staff had the week off, however, so including their 0 sales in the calculated

average doesn’t accurately describe the average sales per representative.

The AVERAGE function ignores blank cells, but it does not ignore cells that contain 0.