Microsoft Office Tutorials and References
In Depth Information
Using functions in your formulas
Every left parenthesis, of course, must have a matching right parenthesis. If you have
many levels of nested parentheses, keeping them straight can sometimes be diffi cult. If the
parentheses don’t match, Excel displays a message explaining the problem — and won’t let
you enter the formula.
In some cases, if your formula contains mismatched parentheses, Excel may propose a
correction to your formula. Figure 15.1 shows an example of a proposed correction. You may be
tempted simply to accept Excel’s suggestion, but be careful — in many cases, the proposed
formula, although syntactically correct, isn’t the formula you intended and it will produce
an incorrect result.
FIGURE 15.1
Excel sometimes suggests a syntactically correct formula, but not the formula
you had in mind.
When you’re editing a formula, Excel lends a hand in helping you match parentheses by displaying matching
parentheses in the same color.
Using functions in your formulas
Many formulas you create use worksheet functions. These functions enable you to greatly
enhance the power of your formulas and perform calculations that are diffi cult (or even
impossible) if you use only the operators discussed previously. For example, you can use the
TAN function to calculate the tangent of an angle. You can’t do this complicated calculation
by using the mathematical operators alone.
Examples of formulas that use functions
A worksheet function can simplify a formula signifi cantly.
15
Here’s an example. To calculate the average of the values in ten cells (A1:A10) without
using a function, you’d have to construct a formula like this:
=(A1+A2+A3+A4+A5+A6+A7+A8+A9+A10)/10
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