Texas Instruments TI-73, TI-73 EXPLORER User Manual 2

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In this guidebook, TI-73 refers to both the TI-73 and TI-73 Explorer. All functions, instructions, and examples in this guidebook work identically for both the TI-73 and the TI-73 Explorer.

Macintosh is a registered trademark of Apple Computer, Inc.

Important Information

Texas Instruments makes no warranty, either express or implied, including but not limited to any implied warranties of merchantability and fitness for a particular purpose, regarding any programs or book materials and makes such materials available solely on an “as-is” basis.

In no event shall Texas Instruments be liable to anyone for special, collateral, incidental, or consequential damages in connection with or arising out of the purchase or use of these materials, and the sole and exclusive liability of Texas Instruments, regardless of the form of action, shall not exceed the purchase price of this calculator. Moreover, Texas Instruments shall not be liable for any claim of any kind whatsoever against the use of these materials by any other party.

US FCC Information Concerning Radio Frequency Interference

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 with 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 not expressly approved by Texas Instruments may void your authority to operate the equipment.

This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus set out in the Radio Interference Regulations of the Canadian Department of Communications.

Table of ContentsTable of Contents

Chapter 1: Operating the TIN73 1

Preparing to Use Your TIN73.........................................3

The Home Screen........................................................... 5

Entering Numbers and Other Characters ..................... 6

Functions and Instructions ..........................................12

Entering Expressions.................................................... 15

Retrieving Previous Entries - £ ......................17

Recalling and Storing the Last Answer - ¢ ......18

Mode Settings.............................................................. 22

Chapter 2: Math Operations 25

Keyboard Math Operations ........................................27

The 1 MATH Menu ................................................ 34

The 1 NUM Menu .................................................. 44

The 1 PRB Menu ....................................................49

The 1 LOG Menu.................................................... 54

Chapter 3: Fractions 57

Entering Fractions........................................................ 58

Using Fractions in Calculations ...................................59

Fraction Modes ............................................................60

Converting between Fractions and Decimals............. 64

Converting between Mixed Numbers and

Simple Fractions......................................................65

Chapter 4: Measurement Conversions and Constant Calculations 67

The - ‚ CONVERSIONS Menu.......................68

Constants...................................................................... 71

Chapter 5: Lists 77

Steps for Creating a List ..............................................78

The List Editor 3 ....................................................79

Naming a List ...............................................................79

Entering List Elements ................................................. 81

Editing Lists in the List Editor...................................... 87

The - v Ls Menu .................................................91

The - v OPS Menu ..............................................92

List Commands from the Home Screen .................... 102

TIN73 Table of Contents

Chapter 6: Statistical Plots 107

Steps for Defining a Stat Plot ................................... 108

Defining Statistical Data in Lists ............................... 109

Deselecting Y

Defining a Stat Plot ................................................... 109

Selecting Stat Plot Types ........................................... 111

Defining Stat Plot Options........................................ 112

Adjusting Window Values and Format .................... 114

Displaying the Stat Plot............................................. 114

Stat Plot Examples ..................................................... 114

Chapter 7: Statistical Analyses 127

The - v MATH Menu........................................ 128

The - v CALC Menu.......................................... 133

Chapter 8: Tables 149

What Is a Table? ........................................................ 150

Steps for Creating a Table ........................................ 151

Defining and Selecting Functions in the

Y= Editor &........................................................ 152

Setting Up the Table - f ............................ 153

Displaying the Table - i............................... 154

Table Setup from the Home Screen ......................... 161

Functions .......................................... 109

Chapter 9: Function Graphing 163

Steps for Graphing a Function.................................. 164

Example of Function Graphing................................. 165

Defining Functions in the Y= Editor & ................. 167

Selecting a Graph Style ............................................. 169

Setting the Window Format - g................ 171

Defining Window Values .......................................... 173

Displaying a Graph *....................................... 177

Adjusting Window Values with

the ( ZOOM Menu ........................................ 181

The ( MEMORY Menu........................................ 185

Chapter 10: Drawing 187

The 2 DRAW Menu ............................................. 188

The 2 POINTS Menu............................................ 201

The 2 STO Menu ................................................. 206

TIN73 Table of Contents

Chapter 11: Trigonometry 209

The - u TRIG Menu ........................................... 210

Graphing Trig Functions............................................ 214

The - u ANGLE Menu ....................................... 215

Chapter 12: Programming 221

What Is a Program? ...................................................223

Steps for Creating a Program.................................... 223

Creating and Naming a New Program .....................224

Entering Program Commands...................................226

The 8 CTL Menu ..................................................227

The 8 I/O Menu.................................................... 241

Editing Program Commands .....................................248

Executing a Program .................................................251

Debugging a Program............................................... 252

Chapter 13: Communication Link and the CBLàCBR Application 253

TIN73 Link Capabilities...............................................254

The Link SEND Menu 9 1 ................................... 255

The Link RECEIVE Menu 9 1 "..........................257

Transmitting Data Items............................................258

Backing Up Memory ..................................................261

Upgrading your TIN73 Graph Explorer Software.....262

The APPLICATIONS Menu 9............................... 263

Steps for Running the CBLàCBR Application .......... 264

Selecting the CBL/CBR Application ...........................265

Specifying the Data Collection Method ...................265

Specifiying Data Collection Options......................... 266

Collecting the Data.................................................... 273

Stopping Data Collection ..........................................274

Chapter 14: Memory Management 275

The - Ÿ MEMORY Menu................................... 276

Appendix A: Function and Instruction Reference 283

TI-73 Table of Contents

Appendix B: Reference Information 319

The TIN73 Menu Map ................................................ 320

The VARS Menu -

Equation Operating System (EOS é)........................ 330

In Case of Difficulty ................................................... 330

Correcting an Error.................................................... 331

Error Messages........................................................... 332

Appendix C: BatteryàService and Warranty Information 339

Battery Information .................................................. 340

Texas Instruments (TI) Support and Service ............. 342

Warranty Information............................................... 343

Index 345

}

....................................... 329

Operating the Operating the

TITIN

7373

Preparing to Use Your TIN73................................................. 3

Installing the AAA Batteries........................................... 3

Turning the TIN73 On and Off .......................................3

Adjusting the Display Contrast ......................................4

Resetting Memory and All Defaults............................... 4

The Home Screen................................................................... 5

Entering Numbers and Other Characters.............................6

Entering a Negative Number a................................... 6

Entering a Number in Scientific Notation - {....... 7

Entering Secondary Functions -...............................7

Entering Text - t................................................. 7

Common Display Cursors ..............................................10

Editing Numbers and Characters .................................11

Functions and Instructions ..................................................12

Accessing Functions and Instructions from Menus .....12

Accessing FunctionsàInstructions from the CATALOG... 14

Entering Expressions............................................................15

Grouping Parts of Expressions with Parentheses ........16

Using Implied Multiplication in Expressions................ 16

Entering Multiple Expressions on One Line ................16

Retrieving Previous Entries - £..............................17

Recalling and Storing the Last Answer - ¢.............. 18

Continuing a Calculation with Ans .............................. 18

Using Ans as a Variable in an Expression ....................19

Storing Values to a Variable X ............................. 20

Recalling Variable Values - P .............................21

Chapter 1: Operating the TIN73

Mode Settings ..................................................................... 22

Numeric Notation Mode .............................................. 23

Decimal Notation Mode ............................................... 24

Angle Mode .................................................................. 24

Display Format Mode ................................................... 24

Simplification Mode ..................................................... 24

Chapter 1: Operating the TIN73

Preparing to Use Your

Before using your TIN73, you must install the batteries, turn on the calculator, and adjust the contrast. You may reset (clear) the calculator memory and defaults, if desired.

TIN

Installing the AAA BatteriesInstalling the AAA Batteries

Install four AAA batteries in the battery compartment on the back of the calculator. Arrange the batteries according to the polarity (+ and -) diagram in the battery compartment. For more information about installing batteries, see Appendix C: BatteryàService and Warranty Information.

Turning the Turning the

To turn on the TIN73, press ^.

To turn off the TIN73 manually, press the yellow - key and then press ^ (indicated in this book as - ).

When you press - , all settings and memory contents are retained by Constant Memoryè. Any error condition is cleared. To prolong battery life, the APDè (Automatic Power Down) feature turns the TIN73 off automatically after a few minutes without any activity.

TITIN

7373

On and Off On and Off

When you turn on the calculator:

• The Home screen is displayed if you previously turned off

the calculator by pressing - . It appears as it did

when you last used it; all errors are cleared.

 or 

• The calculator displays the last screen (including the

display, cursor, and any errors) that was displayed before

Automatic Power Down turned off the calculator.

Chapter 1: Operating the TIN73

Adjusting the Display ContrastAdjusting the Display Contrast

The brightness and contrast of the display can depend on room lighting, battery freshness, and viewing angle.

To adjust the contrast:

1. Press and release the yellow - key.

2. Press and hold $ (to darken the screen) or # (to lighten

the screen).

As you change the contrast setting, a number from 0 (lightest) to 9 (darkest) in the top-right corner indicates the current setting. You may not be able to see the number if the contrast is too light or too dark.

Resetting Memory and All DefaultsResetting Memory and All Defaults

Follow these steps to reset the TIN73 to its factory settings and clear all memory:

1. Turn on the calculator.

The ^ key

2. Display the

-Ÿ (above _ )

3. Display the

4. Display the menu.

MEMORY

RESET

RESET RAM

menu.

Chapter 1: Operating the TIN73

5. Select

All memory is cleared, and the calculator is reset to the factory settings.

When you reset the TIN73, the display contrast is reset. To adjust the contrast, follow the directions in the previous section.

2:Reset

The Home Screen

The Home screen is the primary screen of the TIN73. To go to the Home screen from any other screen or menu, press - l.

On the Home screen, you can enter instructions, functions, and expressions. The answers are displayed on the Home screen. The TIN73 screen can display a maximum of eight lines with a maximum of 16 characters per line.

When you calculate an entry on the Home screen, depending upon space, the answer is displayed either directly to the right of the entry or on the right side of the next line.

If an entry is longer than one line on the Home screen, it wraps to the beginning of the next line.

Chapter 1: Operating the TIN73

If all lines of the display are full, text scrolls off the top of the display. The TIN73 stores the previous entries as memory permits. See the section entitled, Retrieving Previous Entries on page 17.

You can scroll up with $ to see

If you

previously entered entries press b while a previous entry is highlighted (for example, 2+2+2+2+2+2+2+2), the calculator copies it to a new line below all entries (after 4+4+4 and its result, 52).

To clear the Home screen, see the section entitled Editing Numbers and Characters on page 11.

Entering Numbers and Other

Scroll up with $.

Characters

A symbol or abbreviation of each keys primary function is printed in white on the key. When you press that key, the function name is inserted at the cursor location.

Entering a Negative Number Entering a Negative Number a

You enter a negative number with the negation key, a. You can use negation to modify a number, expression, or each element in a list. Notice that this is different from the subtraction key, T, which CANNOT be used for negation.

Subtract M14 N 68.

-l:

14T68

Chapter 1: Operating the TIN73

Entering a Number in Scientific Notation Entering a Number in Scientific Notation -

Using - {, you can enter a number in scientific notation. The notation used to display the result of a calculation depends upon the

setting (

Normal

Sci

). For more information on selecting modes, see the section in this chapter entitled Mode Settings.

4 + 8600.

Add 30

-l:

-{\

8600

Entering Secondary Functions Entering Secondary Functions -

The - ke

The secondary function of each key is printed in yellow above the key. When you press the yellow - key, the yellow character, abbreviation, or word above a key, becomes active for the next keystroke.

, which is the same as pressing - and

TEXT

MATH

- t

then 1, displays the Text editor.

displays four math menus.

{

If in mode

If in

Normal

mode

Sci

Entering Text Entering Text

- t

Many examples in this manual require you to enter alphabetic characters, braces, a quotation mark, a space, or test operators. You can access all of these from the Text editor.

To exit the Text editor without saving the contents on the entry line, press - l, and the calculator returns you to the Home screen.

Chapter 1: Operating the TIN73

In all guidebook examples, when a character in the Text editor needs to be selected, the keystroke sequence shows the character followed by b. Moving the Selection Cursor as necessary to highlight the character is implied. To exit the Text editor and display the contents on the entry line on the

previous screen, select

Done

-t

The entry line

Selection CursorHighlights the character you want to

select. Use the cursor keys (", !, $, and #) to move the cursor.

is highlighted

with the selection cursor in the - t example screen.

Letters

(A-Z)

List Braces

{ }

Quotation Mark (

) Places a space between characters. It is

Space (

Test Operators

=, , >, , <, 

Logic (Boolean) Operators

and, or

Lists letters A-Z in alphabetical order.

Surround a set of numbers separated by commas to create a list (outside of the List

on the Home

editor). For example,

{1,2,3}

screen is interpreted as a list.

) Surrounds the first text element in a

categorical list or surrounds an attached list formula. (See Chapter 5: Lists for more information.)

frequently used in programs.

Used to compare two values.

Used to interpret values as zero (false) or nonzero (true).

Chapter 1: Operating the TIN73

Done

Exits the Text editor when selected and pastes all contents on the entry line to the cursor location on the previous screen.

Entry Line

Displays all currently selected characters.

ll edit keys, except the cursor keys, edit

characters on the entry line.

Insert R on the Home screen.

1. Go to the Home screen and

clear it, if desired.

-l:

2. Use the Text editor to

select

-t

3. Exit the Text editor.

Done

Use $, #, ", and

to highlight R.

is pasted to

the entry line.

The Home screen

Test and Logic (Boolean) Operators

You select test and logic operators exactly as you would a letter. Both types of operators are explained in detail in Chapter 2: Math Operations.

Chapter 1: Operating the TIN73

Entry Line

The entry line displays all characters selected in the Text editor. The entry line also accepts all number keys (Y, Z, [, ) and many keyboard operations (6, I, \, C, etc.). Enter these between Text editor characters, as necessary, without leaving the Text editor.

If you press a key that isnt accepted in the Text editor, the calculator does not return an error. You must select exit and then continue your entry on the previous screen.

You can enter up to 16 characters on the entry line. If you need

to save your

to enter more than 16 characters, select entry. Then reenter the Text editor, and continue entering additional characters.

Done

Common Display CursorsCommon Display Cursors

In most cases, the appearance of the cursor indicates what happens when you press the next key or select the next menu item.

If you press - while the Insert Cursor (Û) is displayed, the underline cursor becomes an underlined #.

Cursor Appearance Effect of Next Keystroke

Entry Solid RectangleÙA character is entered at the

cursor; any existing character is overwritten.

Insert Underline

Second Reverse ArrowÛA 2nd character (yellow on the

Full Checkerboard

Rectangle

A character is inserted in front of the cursor location.

keyboard) is entered, or a 2nd operation is executed.

No entry; the maximum characters are entered at a prompt, or memory is full.

Chapter 1: Operating the TIN73

Editing Numbers and CharactersEditing Numbers and Characters

Using the edit keys, you can edit an entry on the Home screen or Y= editor, programming commands in the Program editor, the entry lines of the Text editor and List editor, and constants in the Set Constant editor.

Keystrokes Result

! or " Moves the cursor to the left or right. Moves the

Selection cursor in the Text editor.

$ or # Moves/scrolls the cursor up or down.

- ! Moves the cursor to the beginning of an entry.

- " Moves the cursor to the end of an entry.

: • Within a line on the Home screen, it

clears all characters to the right of the cursor.

• At the beginning or end of a line on the

Home screen, it clears the current line.

• On a blank line on the Home screen, it

clears everything on the Home screen.

• In an editor, it clears the expression or

value where the cursor is located.

/ Deletes the character at the cursor.

- m Inserts characters in front of a character; to

end insertion, press - m or press !, ", $ or #.

< Inserts a character before a fraction on the

Home screen. (- m inserts a character before a fraction on any other screen.)

I Inserts the variable

at the cursor location.

Chapter 1: Operating the TIN73

Functions and Instructions

A function returns a value. Generally, the first letter of each function is lowercase on the TIN73. For example, function because it returns a value,

An instruction initiates an action. Generally, the first letter of each instruction name is uppercase. For example, instruction that draws a pixel on the graph screen.

Most functions and some instructions take at least one argument. An open parenthesis ( instruction name prompts you to enter an argument. Complete the function with an end parenthesis, E.

Note: Do not use the Text editor to enter names of functions or instructions. For example, you cannot enter

to calculate the log of a value. If you did this, the calculator

would interpret the entry as implied multiplication of the

, and G.

variables

When this guidebook describes the syntax of a function or instruction, each argument is in italics. Optional arguments for a function are signified by brackets [ ]. Do not enter the brackets.

L, O

or 1.

) at the end of the function or

(

pxl-Test(

Pxl-On(

, then O, then

is a

is an

Accessing Functions and Instructions from MenusAccessing Functions and Instructions from Menus

You can find most functions and instructions on menus (in other words, not directly from the keyboard).

Displaying a Menu

To display a menu, press the key associated with the menu. Up to four separate menus are displayed from which you choose the menu item you want.

Chapter 1: Operating the TIN73

To move from menu to menu on a menu screen, press " or ! until the menu name is highlighted.

When a menu item ends in an ellipsis (), the item displays a secondary menu or editor when you select it.

-‚

Accessing and Selecting Menu Items

To scroll up or down the menu items, press $ or #. To wrap to the last menu item directly from the first menu item, press $. To wrap to the first menu item directly from the last menu item, press #.

When the menu continues beyond the displayed items, a $ replaces the colon next to the last displayed item.

Select a menu item in one of two ways:

• Press # or $ to move the cursor to the number or letter

of the item, and then press b.

• Press the number key for the number next to the item. If

a letter is next to the item, access letters from the Text editor (- t).

After you select an item from a menu, you usually are returned to the initial screen where you were working.

Exiting a Menu without Making a Selection

Exit a menu without making a selection in one of three ways:

• Press : to return to the screen where you were.

• Press - l to return to the Home screen.

• Press a key or key sequence for another menu or for

another screen (except - t, which is not accessible from all screens).

Chapter 1: Operating the TIN73

Accessing FunctionsAccessing Functionsà

Instructions from theInstructions from the

CATALOGCATALOG

- | displays the

CATALOG

list of all functions, instructions, programming commands, variables, and symbols on the TIN73. If, for example, you cannot remember where a particular menu item is located, you can find it in the

CATALOG

Items that begin with a number are in alphabetical order according to the first letter after the number. For example,

1-Var Stats

is among the items that begin with V.

Items that are symbols follow the last item that begins with You can access the symbols quickly by pressing $ from the

. The cursor moves to the bottom of the

first catalog item,

A§b/c

list.

Selection Cursor

To select an item from the

CATALOG

, which is an alphabetical

1. Press - | to display the

CATALOG

. The Selection

Cursor always points to the first item.

2. Press $ or # to scroll the

CATALOG

until the Selection

Cursor points to the item you want.

To jump to the first item beginning with a particular letter, select that letter from the Text editor. Press - t while in the

CATALOG

, use the cursor keys to highlight the

letter you want, and then press b. You are automatically returned to the

CATALOG

, and the Selection Cursor has now moved to the new section. Scroll to the item you want.

3. Press b to paste the

CATALOG

item to the current

screen.

Chapter 1: Operating the TIN73

Enter the

1. Go to the

2. Select L from Text editor.

Selecting ¨ by pressing b pastes it to the previous screen, just as if you had selected it from a menu.

CATALOG

-t

and go directly to the section starting with

CATALOG.

Entering Expressions

An expression is a group of numbers, variables, functions and their arguments, or a combination of these elements that evaluates to a single answer. Instructions cannot be used in expressions. An expression is completed when you press b, regardless of the cursor location.

On the TIN73, you enter an expression in the same order as you would write it on paper. The entire expression is evaluated according to the Equation Operating System (EOS rules (which is explained in detail in Appendix B: Reference Information), and the answer is displayed.

Calculate the area (A) of a circle whose radius (R)=3 using the

formula A=pR of a cylinder whose height (H)=4. Use the formula V=AQH.

. Then use the area to calculate the volume (V)

-l: 6b

-„



)

Chapter 1: Operating the TIN73

M4b

is the previous

Ans

answer, 28.27433388.

Grouping Parts of Expressions with ParenthesesGrouping Parts of Expressions with Parentheses

The calculator calculates an expression within parentheses first.

Calculate 4(1+2).

-l:

4D1\2

4(1+2)=4(3)=12

Using Implied Multiplication in ExpressionsUsing Implied Multiplication in Expressions

The calculator understands that two numbers separated by parentheses are multiplied together.

Calculate 4Q3 using parentheses.

-l: Eb

4D3

Entering Multiple Expressions on One LineEntering Multiple Expressions on One Line

To store more than one expression on a line, separate two or more expressions or instructions on a line with a colon (- | $ $ $ b)

Define the variable, R=5, and then calculate pR2 on the same

line.

1. Store 5 to

-l:

X-t

Done

$$$b

Chapter 1: Operating the TIN73

2. Enter the second

, and

expression,

calculate the result.

-„-t b

Done

Retrieving Previous Entries -

When you press b on the Home screen to evaluate an expression or execute an instruction, the expression or

(last entry).

instruction is placed in a storage area called When you turn off the TIN73,

is retained in memory.

Entry

You can retrieve the last entry to the current cursor location, where you can edit it, if desired, and then execute it. On the Home screen or in an editor, press - £; the current line is cleared and the last entry is pasted to the line.

The TIN73 retains as many previous entries as memory permits. To cycle through these entries, press - £ repeatedly. To view stored entries, use $ to scroll up the Home screen.

Store 1 to variable A, 1 to variable B, and then 3 to variable A

using - £.

1. Store 1 to

-l:

X-t

Done

2. Recall the last entry.

-£

Chapter 1: Operating the TIN73

3. Edit and enter the new expression.

!-t

4. Cycle back two entries.

-£-£

5. Edit and enter the new expression.

!!!

Done

Recalling and Storing the Last Answer

When an expression is evaluated successfully from the Home screen or from a program, the TIN73 stores the answer to a

(last answer). Recall

system variable called pressing - ¢. turn off the TIN73, the value in

Ans

can be a real number or a list. When you

Ans

is retained in memory.

Ans

You can use the variable for the type of answer real number, you can use it anywhere where real numbers are accepted (Y= editor,

WINDOW

in any place that is appropriate

Ans

represents. For example, if

Ans

, List editor, etc.).

Continuing a Calculation with AnsContinuing a Calculation with Ans

You can recall without entering the value again or pressing - ¢. After completing a calculation, press an operation or function key (excluding <, =, or @) and the calculator displays and uses the value in the next calculation.

as the first entry in the next expression

Ans

is a

Ans

Chapter 1: Operating the TIN73

1. Calculate 34 using the

Ans

feature.

-l: b

3M3

2. Check your answer, if desired.

374

Using Ans as a Variable in an ExpressionUsing Ans as a Variable in an Expression

Since you would any other variable. When the expression is evaluated, the TIN73 uses the value of For more information about variables, see the next two sections in this chapter entitled, Storing Values to a Variable and Recalling Variable Values.

is a variable, you can use it in expressions just as

Ans

in the calculation.

Ans

Calculate the area of a garden plot 1.7 meters by 4.2 meters.

Then calculate the yield per square meter if the plot produces a total of 147 tomatoes.

1. Calculate the area.

-l:

1.7M4.2

2. Divide 147 by

, which

Ans

was calculated in the first step.

F-¢b

147

Ans=7.14

Chapter 1: Operating the TIN73

Storing Values to a Variable Storing Values to a Variable X

You can store values or expressions that result in one value or lists to a one-letter variable or a system variable (types are listed below) to save for later use. Also, you can save a result

to a variable before you evaluate

for later use by storing another expression.

When an expression containing the name of a variable is evaluated, the value of the variable at that time is used. You can enter and use several types of data for variables, including real numbers, lists, functions, statistical plots, and graph pictures.

Variable names cannot be the same as a name that is preassigned by the TIN73. These include built-in functions

, instructions such as

such as such as

abs( Xmin

Variable Type Names

Ans

, and system variables

Line(

)

, and any user-defined

}

)

2:Y-Vars

)

from the

Real Numbers

ListsNumerical and Categorical

Functions

Stat Plots

, , Z (-

A, B

list names (-

Y Plot1, Plot2, Plot3

Program editor)

Graph Pictures

System Variables

Pic1, Pic2, Pic3 Xmin, Xmax

,  (-

}

4:Picture

1:Window

Store a value to either a system variable or a letter variable from the Home screen or a program using the

key. Begin

on a blank line and follow these steps.

)

Chapter 1: Operating the TIN73

1. Enter the numeric value. It can be an expression that results in a numeric value.

2. Press X. " is copied to the cursor location.

3. Select the type of variable to which you want to store the value. Use the Text editor (- t) to enter a letter

(- }) menu to enter a system

variable, the variable, or the - v

VARS

menu to enter a list name.

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

Store 10 to R, and then calculate pR

1. On the Home screen, store

10 to

-l: X-t

Done

2. Calculate

-„-t

Done

Recalling Variable Values Recalling Variable Values

- P

To recall a variables value to the current cursor location, follow these steps. To leave

1. Press - P.

and the edit cursor are displayed on

Rcl

, press :.

Rcl

the bottom line of the screen.

2. Enter the name of the variable in any of four ways:

• Enter letters using the Text editor (- t).

• Press - v, and then select the name of the list

menu.

from the

Chapter 1: Operating the TIN73

• Press - } to display the

menu; next select

VARS

the type and then the name of the variable or function.

• Press 8 (from the Program editor only), and then

select the name of the program to call a program as a subroutine within another program.

3. The variable name you selected is displayed on the bottom line and the cursor disappears.

4. Press b. The variable contents are inserted where the cursor was located before you began these steps.

function. (R was defined in the

Calculate 100+R using the

Rcl

previous section, Storing Variable Values.)

1. On the Home screen, enter the first part of the calculation.

-l:

100

2. Recall R.

-P-t b

Done

3. Finish the calculation.

b b

Mode Settings

Mode settings control how the TIN73 interprets and displays numbers. Mode settings are retained by the Constant Memory feature when the TIN73 is turned off. All numbers, including elements of lists, are displayed according to the current mode settings, as applicable. To display the mode settings, press .. The default settings are highlighted on the following screen.

=10

Chapter 1: Operating the TIN73

To select a mode setting, highlight the one you want by using the cursor keys, and then press b.

Default

Settings

Normal Sci Float 0123456789 Degree Radian A§b/c b/c Autosimp Mansimp

Numeric Notation mode

Decimal Notation mode

ngle mode

Display Format mode (fractions only)

Simplification mode (fractions only)

Numeric Notation ModeNumeric Notation Mode

The Numeric Notation mode settings affect the way an answer is displayed on the TIN73. Numeric answers can be displayed with up to 10 digits and a two-digit exponent. Answers (excluding fractional ones) on the Home screen, list elements in the List editor, and table elements on the Table screen are displayed according to the Numeric Notation mode selected.

setting displays results with digits to the left and

Normal

The right of the decimal, as in

The

(scientific) setting expresses numbers with one digit to

Sci

123456.78

the left of the decimal and the appropriate power of 10 to the right of

, as in

1.2345678 © 5

, (which is the same as

Note: Answers that have more than 10 digits and whose absolute value is greater than .001 are displayed in scientific notation.

123456.78

Chapter 1: Operating the TIN73

Decimal Notation ModeDecimal Notation Mode

The Decimal Notation mode has two settings,

0123456789

on the TIN73.

The digits, plus the sign and decimal.

, which only affect the way an answer is displayed

(floating decimal point) setting displays up to 10

Float

and

0123456789

The number of digits (

(fixed decimal point) setting specifies the

through 9) to display to the right of the

decimal. Place the cursor on the desired number of decimal digits, and then press b.

The decimal setting applies to answers (excluding fractional ones) on the Home screen, X- and Y-coordinates on a graph display, list elements in the List editor, table elements on the Table screen, and regression model results.

Angle ModeAngle Mode

The Angle mode has two settings,

Degree

control how the TIN73 interprets angle values in trigonometric functions. See Chapter 11: Trigonometry for a detailed explanation.

and

Radian

, which

Display Format ModeDisplay Format Mode

The Display Format mode has two settings, which determine if a fraction is displayed as a mixed or simple fraction. See Chapter 3: Fractions for a detailed explanation.

A§b/c

and

Simplification ModeSimplification Mode

The Simplification mode has two settings,

Mansimp

, which determine if the calculator automatically

Autosimp

simplifies a fractional result completely or if you must simplify the results manually step-by-step. See Chapter 3: Fractions for detailed information.

and

b/c

+ 334 hidden pages

Texas Instruments TI-73, TI-73 EXPLORER User Manual 2

Specifications and Main Features

Frequently Asked Questions

User Manual

Table of ContentsTable of Contents

Chapter 2: Math Operations 25

Chapter 3: Fractions 57

Chapter 4: Measurement Conversions and Constant Calculations 67

Chapter 5: Lists 77

Chapter 6: Statistical Plots 107

Chapter 7: Statistical Analyses 127

Chapter 8: Tables 149

Chapter 9: Function Graphing 163

Chapter 10: Drawing 187

Chapter 11: Trigonometry 209

Chapter 12: Programming 221

Chapter 14: Memory Management 275

Appendix B: Reference Information 319

Index 345

Installing the AAA BatteriesInstalling the AAA Batteries

Adjusting the Display ContrastAdjusting the Display Contrast

Resetting Memory and All DefaultsResetting Memory and All Defaults

The Home Screen

Entering a Number in Scientific Notation Entering a Number in Scientific Notation -

Entering Secondary Functions Entering Secondary Functions -

Entering Text Entering Text

Common Display CursorsCommon Display Cursors

Editing Numbers and CharactersEditing Numbers and Characters

Functions and Instructions

Accessing Functions and Instructions from MenusAccessing Functions and Instructions from Menus

Accessing FunctionsAccessing Functionsà

Entering Expressions

Grouping Parts of Expressions with ParenthesesGrouping Parts of Expressions with Parentheses

Using Implied Multiplication in ExpressionsUsing Implied Multiplication in Expressions

Entering Multiple Expressions on One LineEntering Multiple Expressions on One Line

Recalling and Storing the Last Answer

Continuing a Calculation with AnsContinuing a Calculation with Ans

Using Ans as a Variable in an ExpressionUsing Ans as a Variable in an Expression

Storing Values to a Variable Storing Values to a Variable X

Recalling Variable Values Recalling Variable Values

Mode Settings

Numeric Notation mode

Decimal Notation ModeDecimal Notation Mode

Angle ModeAngle Mode

Display Format ModeDisplay Format Mode

Simplification ModeSimplification Mode