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294 Formula Editor Chapter 9
Using Functions
Table 9.2 Keypad Buttons in the Formula Editor (Continued)
Key Name Description
Exponent Raises a given value to a specified power. It has an exponent of two by default. The
power is initially highlighted and can be changed to another value.
Root Calculates the specified root of the radicand. It has an implied index of two (a
square root), which is not displayed. The index area is initially highlighted so you
can enter a different index value.
Switch
terms
Unary sign
function
Local
variable
Delete
expression
(peel)
Looks at the operator that is central to the selected expression and switches the
expressions on either side of that operator.
Inverts the sign of the argument. Apply the unary sign function to variable
expressions or use it to enter negative constants.
Creates and displays a local variable and assigns it the value of the selected
expression. The local variable has the default name t0 in an expression and a
semicolon after it. See “Using Local Variables,” p. 289, for details about creating
and inserting local variables. See “Using Local Variables in a Formula,” p. 323, for
an example.
Replaces the outermost expression with the first argument. You can repeat this
process to delete a formula term by term. See “Using the Delete Expression Key,”
p. 326, for an example.
Using Functions
You can add many types of functions to a formula. All of these functions are organized in the function
browser. The browser groups collections of functions in lists organized both alphabetically (Functions
(all)) and by topic (Functions (grouped)), as shown in Figure 9.6. Use the function browser to specify
the type of calculation you want to perform on the elements in a formula.
Figure 9.6 The Function Browser