Excel's Formula - sisman

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Part IV: Array Formulas
Working with Multicell Array Formulas
The preceding chapter introduces array formulas that you can enter into multicell ranges. In this
section, I present a few more array multicell formulas. Most of these formulas return some or all
of the values in a range, but are rearranged in some way.
The examples in this section are available on the companion CD-ROM. The file is named
multi-cell array formulas.xlsx.
Returning only positive values from a range
The following array formula works with a single-column vertical range (named Data). The array
formula is entered into a range that’s the same size as Data and returns only the positive values
in the Data range. (Zeroes and negative numbers are ignored.)
{=INDEX(Data,SMALL(IF(Data>0,ROW(INDIRECT(“1:”&ROWS(Data)))),
ROW(INDIRECT(“1:”&ROWS(Data)))))}
As you can see in Figure 15-9, this formula works, but not perfectly. The Data range is A4:A23,
and the array formula is entered into C4:C23. However, the array formula displays #NUM! error
values for cells that don’t contain a value.
Figure 15-9: Using an array formula to return only the positive values in a range.