TEXAS INSTRUMENTS TI 84 PLUS User Manual

TI-84 Plus

TI-84 Plus Silver Edition

Guidebook

Important Information

Important InformationImportant Information

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USA FCC Information Concerning Radio Frequency

USA FCC Information Concerning Radio Frequency USA FCC Information Concerning Radio Frequency Interference

Interference

InterferenceInterference

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation.

If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, you can try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna .

• Increase the separation between the equipment and receiver.

• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

• Consult the dealer or an experienced radio/television technician for help.

Caution: Any changes or modifications to this equipment n ot ex pressly a ppro ved by Texas Instruments may void your authority to operate the equipment.

iii

Chapter 1:

Chapter 1:Chapter 1: Operating the TI-84 Plus Silver Edition

Operating the TI-84 Plus Silver Edition

Operating the TI-84 Plus Silver EditionOperating the TI-84 Plus Silver Edition

Documentation Conventions

Documentation ConventionsDocumentation Conventions

In the body of this guidebook, TI-84 Plus refers to the TI-84 Plus Silver Edition. Sometimes, as in Chapter 19, the full name TI-84 Plus Silver Edition is used to distinguish it from the TI-84 Plus.

All the instructions and examples in this guidebook also work for the TI-84 Plus. All the functions of the TI-84 Plus Silver Edition and the TI-84 Plus are the same. The two graphing calculators differ only in available RAM memory, interchangeable faceplates, and Flash application ROM memory.

TI-84 Plus Keyboard

TI-84 Plus KeyboardTI-84 Plus Keyboard

Generally, the keyboard is divided into these zones: graphing keys, editing keys, advanced function keys, and scientific calculator keys.

Keyboard Zones

Keyboard ZonesKeyboard Zones

Graphing — Graphing keys access the interactive graphing features. Editing — Editing keys allow you to edit expressions and values. Advanced — Advanced function keys display menus that access the advanced

functions.

Chapter 1: Operating the TI-84 Plus Silver Edition 1

Scientific — Scientific calculator keys access the capabilities of a standard scientific

calculator.

TI-84 Plus

TI-84 Plus TI-84 Plus

raphing Keys

Editing Keys

Advanced Function Keys

Scientific Calculator Keys

Chapter 1: Operating the TI-84 Plus Silver Edition 2

Using the Color

Using the Color....Coded Keyboard

Using the ColorUsing the Color

Coded Keyboard

Coded KeyboardCoded Keyboard

The keys on the TI-84 Plus are color-coded to help you easily locate the key you need. The light colored keys are the number keys. The light gray keys along the right side of the

keyboard are the common math functions. The light gray keys across the top set up and display graphs. The Œ key with the purple lettering provides access to applications such as the Inequality Graphing application.

The primary function of each key is printed on the keys. For example, when you press , the

Using the

Using the y and

Using the Using the

MATH menu is displayed.

and ƒ Keys

and and

Key s

Key s Key s

The secondary function of each key is printed in blue above the key. When you press the blue y key, the character, abbreviation, or word printed in blue above the other keys becomes active for the next keystroke. For example, when you press y and then , the

TEST menu is displayed. This guidebook describes this keystroke combination

as y:. The alpha function of each key is printed in green above the key. When you press the

green ƒ key, the alpha character printed in green above the other keys becomes active for the next keystroke. For example, when you press ƒ and then , the letter

A is entered. This guidebook describes this keystroke combination as ƒ [A].

Chapter 1: Operating the TI-84 Plus Silver Edition 3

The y key accesses the second function printed in blue above each key.

ƒ key

The accesses the alpha function printed in green above each key.

Turning On and T urning Off the TI-84 Plus

Turning On and T urning Off the TI-84 PlusTurning On and T urning Off the TI-84 Plus

Turning On the Graphing Calculator

Turning On the Graphing CalculatorTurning On the Graphing Calculator

To turn on the TI-84 Plus, press É.

• If you previously had turned off the graphing calcula to r by pr essing yM, the TI-84 Plus displays the home screen as it was when you last used it and clears any error.

Chapter 1: Operating the TI-84 Plus Silver Edition 4

• If Automatic Power Down™ (APD™) had previously turned off the graphing calculator, the TI-84 Plus wi ll return exactly as you left it, including the display, cursor, and any error.

• If the TI-84 Plus is turned off and connected to another graphing calculator or personal computer, any communication activity will “wake up” the TI-84 Plus.

To prolong the life of the batteries, APD turns off the TI-84 Plus automatically after about five minutes without any activity .

Turning Off the Graphing Calculator

Turning Off the Graphing CalculatorTurning Off the Graphing Calculator

To turn off the TI-84 Plus manually, press y M.

• All settings and memory contents are retained by Constant Memory™.

• Any error condition is cleared.

Batteries

BatteriesBatteries

The TI-84 Plus uses five batteries: four AAA alkaline batteries and one SR44SW or 303 silver oxide backup battery. The silver oxide battery provides auxiliary power to retain memory while you replace the AAA batteries. To replace batteries without losing any information stored in memory, follow the steps in Appendix C.

Chapter 1: Operating the TI-84 Plus Silver Edition 5

Setting the Display Contrast

Setting the Display ContrastSetting the Display Contrast

Adjusting the Display Contrast

Adjusting the Display ContrastAdjusting the Display Contrast

You can adjust the display contrast to suit your viewing angle and lighting conditions. As you change the contrast setting, a number from 0 (lightest) to 9 (darkest) in the top-right corner indicates the current level. You may not be able to see the number if contrast is too light or too dark.

Note: The TI-84 Plus has 40 contrast settings, so each number 0 through 9 represents

four settings. The TI-84 Plus retains the contrast setting in memory when it is turned off. To adjust the contrast, follow these steps.

1. Press and release the y key.

2. Press and hold † or }, which are below and above the contrast symbol (blue, halfshaded circle).

• † lightens the screen.

• } darkens the screen.

Note: If you adjust the contrast setting to 0, the display may become completely blan k. To

restore the screen, press and release y, and then press and hold } until the display reappears.

Chapter 1: Operating the TI-84 Plus Silver Edition 6

When to Replace Batteries

When to Replace BatteriesWhen to Replace Batteries

When the batteries are low, a low-battery message is displayed when you turn on the graphing calculator.

To replace the batteries without losing any information in memory, follow the steps in Appendix C.

Generally , the graphing calculator will continue to operate for one or two weeks after the low-battery message is first displayed. After this period, the TI-84 Plus will turn off automatically and the unit will not operate. Batteries must be replaced. All memory should be retained.

Note: The operating period following the first low-battery message could be longer than

two weeks if you use the graphing calculator infrequently.

The Display

The DisplayThe Dis play

Types of Displays

Types of DisplaysTypes of Displays

The TI-84 Plus displays both text and graphs. Chapter 3 describes graphs. Chapter 9 describes how the TI-84 Plus can display a horizontally or ve rtically sp lit screen to show graphs and text simultaneously.

Home Screen

Home ScreenHome Screen

The home screen is the primary screen of the TI-84 Plus. On this screen, enter instructions to execute and expression s to evaluate. The answers are displayed on the same screen.

Chapter 1: Operating the TI-84 Plus Silver Edition 7

Displaying Entries and Answers

Displaying Entries and AnswersDisplaying Entries and Answers

When text is displayed, the TI-84 Plus screen can display a maximum of 8 lines with a maximum of 16 characters per line. If all lines of the display are full, text scrolls off the top of the display . If an expression on the home screen, the Y= edito r (Chapter 3), or th e program editor (Chapter 16) is longer than one line, it wraps to the beginning of the next line. In numeric editors such as the window screen (Ch apter 3), a long expression scrolls to the right and left.

When an entry is executed on the home screen, the answer is displayed on the right side of the next line.

Entry Answer

The mode settings control the way the TI-84 Plus interprets expressions and displays answers.

If an answer, such as a list or matrix, is too long to display entirely on one line, an ellipsis (

...) is displayed to the right or left. Press ~ and | to display the answer.

Entry Answer

Returning to the Home Screen

Returning to the Home ScreenReturning to the Home Screen

To return to the home screen from any other screen, press y5.

Chapter 1: Operating the TI-84 Plus Silver Edition 8

Busy Indicator

Busy IndicatorBusy Indicator

When the TI-84 Plus is calculating or graphing, a vertical moving line is displayed as a busy indicator in the top-right corner of the screen. When you pause a graph or a program, the busy indicator becomes a vertical moving dotted line.

Display Cursors

Display CursorsDisplay Cursors

In most cases, the appearance of the cursor indicates what will happen when you press the next key or select the next menu item to be pasted as a character.

Cursor Appearance Effect of Next Keystroke

Entry Solid rectangle

A character is entered at the cursor; any existing character is overwritten

Insert Underline

Second Reverse arrow

Alpha Reverse A

Full Checkerboard rectangle#No entry; the maximum characters are entered at

If you press ƒ during an insertion, the cursor becomes an underlined

A character is inserted in front of the cursor location

A 2nd character (blue on the keyboard) is entered or a 2nd operation is executed

An alpha character (green on the keyboard) is entered or SOLVE is executed

a prompt or memory is full

A (A). If you

press y during an insertion, the underlined cursor becomes an underlined # (#). Graphs and editors sometimes display additional cursors, which are described in other

chapters.

Chapter 1: Operating the TI-84 Plus Silver Edition 9

Interchangeable Faceplates

Interchangeable FaceplatesInterchangeable Faceplates

The TI-84 Plus Silver Edition has interchangeable faceplates that let you customize the appearance of your unit. To purchase additional faceplates, refer to the TI Online Store at education.ti.com.

Removing a Faceplate

Removing a FaceplateRemoving a Faceplate

1. Lift the tab at the bottom edge of the faceplate away from the TI-84 Plus Silver Edition case.

2. Carefully lift the faceplate away from the unit until it releases. Be careful not to damage the faceplate or the keyboard.

Chapter 1: Operating the TI-84 Plus Silver Edition 10

Installing New Faceplates

Installing New FaceplatesInstalling New Faceplates

1. Align the top of the faceplate in the corresponding grooves of the TI-84 Plus Silver Edition case.

2. Gently click the faceplate into place. Do not force.

3. Make sure you gently press each of the grooves to ensure the faceplate is installed properly. See the diagram for proper groove placement.

Using the Clock

Using the ClockUsing the Clock

Use the Clock to set the time and date, select the clock display format, and turn the clock on and off. The clock is turned on by default and is accessed from the mode screen.

Chapter 1: Operating the TI-84 Plus Silver Edition 11

Displaying the Clock Settings

Displaying the Clock SettingsDisplaying the Clock Settings

1. Press z

2. Press the † to move the cursor to

SET CLOCK.

3. Press Í.

Changing the Clock settings

Changing the Clock settingsChanging the Clock settings

1. Press the ~ or | to highlight the date format you want, example: M/D/Y. Press Í.

2. Press † to highlight

YEAR. Press ‘ and type

the year, exam ple: 2004.

3. Press † to highlight

MONTH. Press ‘ and

type the number of the month (a number from 1–

12).

4. Press † to highlight

DAY. Press ‘ and type

the date.

5. Press † to highlight

TIME. Press ~ or | to

highlight the time format you want. Press Í.

6. Press † to highlight

HOUR. Press ‘ and type

the hour. A number from 1–12 or 0–23.

Chapter 1: Operating the TI-84 Plus Silver Edition 12

7. Press † to highlight

MINUTE. Press ‘ and

type the minutes. A number from 0–59.

8. Press † to highlight

AM/PM. Press ~ or | to

highlight the format. Press Í.

9. To Save changes, press † to select

SAVE. Press

Í.

Error Messages

Error MessagesError Messages

If you type the wrong date for the month, for example: June 31, June does not have 31 days, you will receive an error message with two choices:

• To Quit the Clock application and return to the Home screen, select

1: Quit. Press Í.

— or —

• To return to the clock application and correct the error, select

Turning the Clock On

Turning the Clock OnTurning the Clock On

2: Goto. Press Í.

There are two options to turn the clock on. One option is through the

MODE screen, the

other is through the Catalog.

Chapter 1: Operating the TI-84 Plus Silver Edition 13

Using the Mode Screen to turn the clock on

1. If the Clock is turned off, Press † to highlight

TURN CLOCK ON.

2. Press Í Í.

Using the Catalog to turn the clock on

1. If the Clock is turned off, Press y N

2. Press † or } to scroll the selection cursor points to

CATALOG until the

ClockOn.

3. Press Í Í.

Turning the Clock Off

Turning the Clock OffTurning the Clock Off

1. Press y N.

2. Press † or } to scroll the selection cursor points to

CATALOG until the

ClockOff.

3. Press Í.

ClockOff will turn off the Clock display.

Chapter 1: Operating the TI-84 Plus Silver Edition 14

Entering Expressions and Instructions

Entering Expressions and InstructionsEntering Expressions and Instructions

What Is an Expression?

What Is an Expression?What Is an Expression?

An expression is a group of numbers, variables, functions and their arguments, or a combination of these elements. An expression evaluates to a single answer. On the TI-84 Plus, you enter an expression in the same order as you would write it on paper. For

example, pR You can use an expression on the home screen to calculate an answer. In most places

where a value is required, you can use an expression to enter a value.

Entering an Expression

Entering an ExpressionEntering an Expression

To create an expression, you enter numb ers, variables, and functions from the keyboard and menus. An expression is completed when you press Í, regardless of the cursor location. The entire expression is evaluated according to Equation Operating System (EOS™) rules, and the answer is displayed.

is an expression.

Most TI-84 Plus functions and operations are symbols comprising several characters. You must enter the symbol from the keyboard or a menu; do not spell it out. For example, to calculate the log of 45, you must press « and

G. If you enter LOG, the TI-84 Plus interprets the entry as implied multiplication of the

variables

Chapter 1: Operating the TI-84 Plus Silver Edition 15

L, O, and G.

45. Do not enter the letters L, O,

Calculate 3.76 P (L7.9 + ‡5) + 2 log 45.

3 Ë 76 ¥ £ Ì 7 Ë 9 Ã

y C

5 ¤ ¤ Ã 2 « 45 ¤

Multiple Entries on a Line

Multiple Entries on a LineMultiple Entries on a Line

To enter two or more expressions or instructions on a line, separate them with colons (ƒ [

Entering a Number in Scientific Notation

Entering a Number in Scientific NotationEntering a Number in Scientific Notation

:]). All instructions are stored together in last entry (ENTRY).

To enter a number in scientific notation, follow these steps.

1. Enter the part of the number that precedes the exponent. This value can be an expression.

2. Press y D. â is pasted to the cursor location.

3. If the exponent is negative, press Ì, and then enter the exponent, which can be one or two digits.

Chapter 1: Operating the TI-84 Plus Silver Edition 16

When you enter a number in scientific notation, the TI-84 Plus does not automatically display answers in scientific or engineering notation. The mode settings and the size of the number determine the display format.

Functions

FunctionsFunctions

A function returns a value. For example,

÷, L, +, ‡(, and log( are the functions in the

example on the previous page. In general, the first letter of each function is lowercase on the TI-84 Plus. Most functions take at least one argument, as indicated by an open parenthesis (

Instructions

InstructionsInstructions

An instruction initiates an action. For example,

( ) following the name. For example, sin( requires one argument, sin(value).

ClrDraw is an instruction that clears any

drawn elements from a graph. Instructions cannot be used in expressions. In general, the first letter of each instruction name is uppercase. Some instructions take more than one argument, as indicated by an open parenthesis ( example,

Interrupting a Calculation

Interrupting a CalculationInterrupting a Calculation

Circle( requires three arguments, Circle(X,Y,radius).

( ) at the end of the name. For

To interrupt a calculation or graph in progress, which is indicated by the busy indicator, press É.

When you interrupt a calculation, a menu is displayed.

• To return to the home screen, select

• To go to the location of the interruption, select

1:Quit.

2:Goto.

Chapter 1: Operating the TI-84 Plus Silver Edition 17

When you interrupt a graph, a partial graph is displayed.

• To return to the home screen, press ‘ or any nongraphing key.

• To restart graphing, press a graphing key or select a graphing instruction.

TI-84 Plus Edit Keys

TI-84 Plus Edit KeysTI-84 Plus Edit Keys

Keystrokes Result

~ or | } or †

y |

y ~

‘

{

y 6

Moves the cursor within an expression; these keys repeat. Moves the cursor from line to line within an expression that occupies

more than one line; these keys repeat. On the top line of an expression on the home screen, cursor to the beginning of the expression. On the bottom line of an expression on the ho me s cre en , † moves the cursor to the end of the expression.

Moves the cursor to the beginning of an expression. Moves the cursor to the end of an expression. Evaluates an expression or executes an instruction. On a line with text on the home screen, clears the current line.

On a blank line on the home screen, clears everything on the home screen. In an editor, clears the expression or value where the cursor is located; it does not store a zero.

Deletes a character at the cursor; this key repeats. Changes the cursor to an underline (__); inserts characters in front of the

underline cursor; to end insertion, press

y6 or press |, }, ~, or

} moves the

†.

Chapter 1: Operating the TI-84 Plus Silver Edition 18

Keystrokes Result

ƒ Changes the cursor to Ø; the next keystroke pastes an alpha character

y 7 Changes the cursor to Ø; sets alpha-lock; subsequent keystrokes (on an

„ Pastes an X in Func mode, a T in Par mode, a q in Pol mode, or an n in

Setting Modes

Setting ModesSetting Modes

Checking Mode Settings

Checking Mode SettingsChecking Mode Settings

Mode settings control how the TI-84 Plus displays and interprets numbers and graphs. Mode settings are retained by the Constant Memory feature when the TI-84 Plus is turned off. All numbers, including elements of matrices and lists, are displayed accord ing to the current mode settings.

Changes the cursor to Þ; the next keystroke performs a 2nd operation (an operation in blue above a key and to the left); to cancel 2nd, press

y again.

(a character in green above a key and to the right) or executes SOLVE (Chapters 10 and 11); to cancel ƒ, press ƒ or press |, },

~, or †.

alpha key) paste alpha characters; to cancel alpha-lock, press you are prompted to enter a name such as for a group or a program, alpha-lock is set automatically.

Seq mode with one keystroke.

ƒ. If

Chapter 1: Operating the TI-84 Plus Silver Edition 19

To display the mode settings, press z. The current settings are highlighted. Defaults are highlighted below. The following pages describe the mode settings in detail.

Normal Sci Eng Float 0123456789 Radian Degree Func Par Pol Seq Connected Dot Sequential Simul Real a+bi re^qi Full Horiz G-T Set Clock

Changing Mode Settings

Changing Mode SettingsChanging Mode Settings

Numeric notation Number of decimal places Unit of angle measure Type of graphing Whether to connect graph points Whether to plot simultaneously Real, rectangular complex, or polar complex Full screen, two split-screen modes 01/01/01 12:00 AM

To change mode settings, follow these steps.

1. Press † or } to move the cursor to the line of the setting that you want to change.

2. Press ~ or | to move the cursor to the setting you want.

3. Press Í.

Chapter 1: Operating the TI-84 Plus Silver Edition 20

Setting a Mode from a Prog ram

Setting a Mode from a Prog ramSetting a Mode from a Prog ram

You can set a mode from a program by entering the name of the mode as an instructi on; for example,

Func or Float. From a blank program command line, select the mode setti ng

from the mode screen; the instruction is pasted to the cursor location.

Normal, Sci, Eng

Normal, Sci, EngNormal, Sci, Eng

Notation modes only affect the way an answer is displayed on the home screen. Numeric answers can be displayed with up to 10 digits and a two-digit exponent. You can enter a number in any format.

Normal notation mode is the usual way we express numbers, with digits to the left and

right of the decimal, as in

Sci (scientific) notation mode expresses numbers in two parts. The significant digits

12345.67.

display with one digit to the left of the decimal. The appropriate power of 10 displays to the right of å, as in

Eng (engineering) notation mode is similar to scientific notation. However, the number

1.234567â4.

can have one, two, or three digits before the de cimal; and the power-o f-10 exponent is a multiple of three, as in

12.34567â3.

Note: If you select Normal notation, but the answer cannot display in 10 digits (or the

absolute value is less than .001), the TI-84 Plus expresses the answer in scientific notation.

Chapter 1: Operating the TI-84 Plus Silver Edition 21

Float, 0123456789

Float, 0123456789Float, 0123456789

Float (floating) decimal mode displays up to 10 digits, plus the sign and decimal. 0123456789 (fixed) decimal mode specifies the number of digits (0 through 9) to display

to the right of the decimal. Place the cursor on the desired number of decimal digit s, and then press Í.

The decimal setting applies to

Normal, Sci, and Eng notation modes.

The decimal setting applies to these numbers:

• An answer displayed on the home screen

• Coordinates on a graph (Chapters 3, 4, 5, and 6)

•The

Tangent( DRAW instruction equation of the line, x, and dy/dx values (Chapter 8)

• Results of CALCULATE operations (Chapters 3, 4, 5, and 6)

• The regression equation stored after the execut ion of a regression model (Chapter 12)

Radian, Degree

Radian, DegreeRadian, Degree

Angle modes control how the TI-84 Plus interprets angle values in trigonometric functions and polar/rectangular conversions.

Radian mode interprets angle values as radians. Answers display in radians. Degree mode interprets angle values as degrees. Answers display in degrees.

Chapter 1: Operating the TI-84 Plus Silver Edition 22

Func, Par, Pol, Seq

Func, Par, Pol, SeqFunc, Par, Pol, Seq

Graphing modes define the graphing par ameters. Chapters 3, 4, 5, and 6 describe these modes in detail.

Func (function) graphing mode plots functions, where Y is a function of X (Chapter 3). Par (parametric) graphing mode plots rela tions, where X and Y are functions of T

(Chapter 4).

Pol (polar) graphing mode plots functions, where r is a function of q (Chapter 5). Seq (sequence) graphing mode plots seq uences (Chap ter6 ).

Connected, Dot

Connected, DotConnected, Dot

Connected plotting mode draws a line connecting each point calculated for the selected

functions.

Dot plotting mode plots only the calculated points of the selected functions.

Sequential, Simul

Sequential, SimulSequential, Simul

Sequential graphing-order mode evaluates and plo ts one func tion c omp letely before the

next function is evaluated and plotted.

Simul (simultaneous) graphing-order mode evaluates and plo t s all se lected functions for

a single value of X and then evaluates and plots them for the next value of X.

Chapter 1: Operating the TI-84 Plus Silver Edition 23

Note: Regardless of which graphing mode is selected, the TI-84 Plus will sequentially

graph all stat plots before it graphs any functions.

i, re^

Real, a+b

Real, a+bReal, a+b

mode does not display complex results unless complex numbers are entered as

Real

, re^qi

, re^, re^

input. Two complex modes display complex results.

•

a+bi (rectangular complex mode) displays complex numbers in the form a+bi.

•

re^qi (polar complex mode) displays complex numbers in the form re^qi.

Full, Horiz, G-T

Full, Horiz, G-TFull, Horiz, G-T

Full screen mode uses the entire screen to display a graph or edit screen.

Each split-screen mode displays two screens simultaneously.

•

Horiz (horizontal) mode displays the current graph on the top half of the screen; it

displays the home screen or an editor on the botto m ha lf (Ch ap te r 9).

•

G-T (graph-table) mode displays the current graph on the left half of the screen; it

displays the table screen on the right half (Chapter 9).

Set Clock

Set ClockSet Clock

Use the clock to set the time, date, and clock display formats.

Chapter 1: Operating the TI-84 Plus Silver Edition 24

Using TI-84 Plus Variable Names

Using TI-84 Plus Variable NamesUsing TI-84 Plus Variable Names

Variables and Defined Items

Variables and Defined ItemsVariables and Defined Items

On the TI-84 Plus you can enter and use several types of data, including real and complex numbers, matrices, lists, functions, stat plots, graph databases, gra ph pictures, and strings.

The TI-84 Plus uses assigned names for variables and other items saved in memory. For lists, you also can create your own five-character names.

Variable Type Names

Real numbers A, B, ... , Z Complex numbers A, B, ... , Z Matrices

Lists L1, L2, L3, L4, L5, L6, and user-defined names Functions Y1, Y2, ... , Y9, Y0 Parametric equations X1T and Y1T, ... , X6T and Y6T Polar functions r1, r2, r3, r4, r5, r6 Sequence functions u, v, w Stat plots Plot1, Plot2, Plot3 Graph databases GDB1, GDB2, ... , GDB9, GDB0

ãAä, ãBä, ãCä, ... , ãJä

Graph pictures Pic1, Pic2, ... , Pic9, Pic0 Strings Str1, Str2, ... , Str9, Str0

Chapter 1: Operating the TI-84 Plus Silver Edition 25

Variable Type Names

Apps Applications AppVars Application variables Groups Grouped variables System variables Xmin, Xmax, and others

Notes about Variables

Notes about VariablesNotes about Variables

• You can create as many list names as memory will allow (Chapter 11).

• Programs have user-defined names and share memory with variables (Chapter 16).

• From the home screen or from a program , you can stor e to mat rice s (Ch a pte r 10), lists (Chapter 11), strings (Chapter 15), system variables such as

TblStart (Chapter 7), and all Y= functions (Chapters 3, 4, 5, and 6).

• From an editor, you can store to matrices, lists, and

Y= functions (Chapter 3).

Xmax (Chapter 1),

• From the home screen, a program, or an edito r, you can store a value to a matrix element or a list element.

• You can use

DRAW STO menu items to store and recall graph databases and

pictures (Chapter 8).

• Although most variables can be archived, system variables including r, t, x, y, and q cannot be archived (Chapter 18)

•

Apps are independent applications.which are stored in Flash ROM. AppVars is a

variable holder used to store variables created by independent applications . You cannot edit or change variables in

AppVars unless you do so through the application

which created them.

Chapter 1: Operating the TI-84 Plus Silver Edition 26

Storing Variable Values

Storing Variable ValuesStoring Variable Values

Storing Values in a Variable

Storing Values in a VariableStoring Values in a Variable

Values are stored to and recalled from memory using variable names. When an expression containing the name of a variable is evalua ted , th e valu e of the var iab l e at that time is used.

To store a value to a variable from the home screen or a program using the ¿ key, begin on a blank line and follow these steps.

1. Enter the value you want to store. The value can be an expression.

2. Press ¿. ! is copied to the cursor location.

3. Press ƒ and then the letter of the variable to whic h you wan t to stor e the valu e.

4. Press Í. If you entered an expression, it is evaluated. The value is stored to the variable.

Displaying a Variable Value

Displaying a Variable ValueDisplaying a Variable Value

To display the value of a variable, enter the name on a blank line on the home screen, and then press Í.

Chapter 1: Operating the TI-84 Plus Silver Edition 27

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