Texas Instruments TI-84 - Manual (Page 100)

Chapter 3: Function Graphing 97
Defining or Editing a Function Defining or Editing a Function Defining or Editing a Function Defining or Editing a Function
To define or edit a function, follow these steps.
1. Press
o to display the Y= editor.
2. Press
† to move the cursor to the function you want to define or edit. To erase a
function, press
‘.
3. Enter or edit the expression to define the function.
• You may use functions and variables (including matrices and lists) in the
expression. When the expression evaluates to a nonreal number, the value is
not plotted; no error is returned.
• The independent variable in the function is X. Func mode defines
„ as X.
To enter X, press
„ or press ƒ
[X] .
• When you enter the first character, the = is highlighted, indicating that the
function is selected.
As you enter the expression, it is stored to the variable Yn as a user-defined function
in the Y= editor.
4. Press
Í or † to move the cursor to the next function.