Operation Manual

Chapter 3: Function Graphing 76
"
expression"!Yn
When the instruction is executed, the TI-84 Plus C stores the expression to the designated variable Yn,
selects the function, and displays the message Done.
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.
Yn(value)
Y
n({value1,value2,value3, . . .,value n})
Selecting and Deselecting Functions
Selecting and Deselecting a Function
You can select and deselect (turn on and turn off) a function in the Y= editor. A function is selected
when the = sign is highlighted. The TI-84 Plus C graphs only the selected functions. You can select any or
all functions Y1 through Y9, and Y0.
To select or deselect a function in the Y= editor, follow these steps.
1. Press o to display the Y= editor.
2. Move the cursor to the function you want to select or deselect.
3. Press | to place the cursor on the function’s
= sign.
4. Press Í to change the selection status.
When you enter or edit a function, it is selected automatically. When you clear a function, it is
deselected.
Turning On or Turning Off a Stat Plot in the Y= Editor
To view and change the on/off status of a stat plot in the Y= editor, use Plot1 Plot2 Plot3 (the top line
of the Y= editor). When a plot is on, its name is highlighted on this line.
To change the on/off status of a stat plot from the Y= editor, press } and ~ to place the cursor on
Plot1, Plot2, or Plot3, and then press Í.