Texas Instruments TI-84 Plus Guide Book

Chapter 3: Function Graphing 98
Defining a Function from the Home Screen or a Program
Defining a Function from the Home Screen or a ProgramDefining a Function from the Home Screen or a Program
Defining a Function from the Home Screen or a Program
To define a function from the home screen or a program, begin on a blank line and follow
these steps.
1. Press ƒ
[ã], enter the expression, and then press ƒ [ã] again.
2. Press ¿.
3. Press  ~
1 to select 1:Function from the VARS Y-VARS menu.
4. Select the function name, which pastes the name to the cursor location on the home
screen or program editor.
5. Press Í to complete the instruction.
"expression"!Yn
When the instruction is executed, the TI-84 Plus stores the expression to the designated
variable
Yn, selects the function, and displays the message Done.
Evaluating Y= Functions in Expressions
Evaluating Y= Functions in ExpressionsEvaluating Y= Functions in Expressions
Evaluating Y= Functions in Expressions
You can calculate the value of a Y= function
Yn at a specified value of X. A list of values
returns a list.

Texas Instruments TI-84 Plus Specifications

General

Battery type	AAA
Power source	Battery
Number of batteries supported	4
Type	Graphing
Cover	No
Form factor	Pocket
Control type	Buttons
Product color	Black
USB port	Yes
USB 2.0 ports quantity	1
Digits	- digits
Display number of lines	8 lines
Display number of characters	16
RAM capacity	0.024 MB
ROM capacity	0.480 MB
Storage media type	-