You can use the variable ANS to represent the last answer in most places. When you press y , the variable name ANS is copied to the cursor location. When the expression is evaluated, the TI-80 uses the value of ANS in the calculation. Calculate the area of a garden plot that is 1.7 meters by 4.2 meters. Then calculate the yield per square meter if the plot produces a total of 147 tomatoes. 147 e y

1.7 p 4.2

Continuing an Expression
You can use the value in ANS as the first entry in the next expression without entering the value again or pressing y. On a blank line on the Home screen, enter the function. The TI-80 types the variable name ANS followed by the function.

Storing Answers

p 9.9 To store an answer, store ANS to a variable before you evaluate another expression. Calculate the area of a circle of radius 5 meters. Then calculate the volume of a cylinder of radius 5 meters and height 3.3 meters. Store the result in the variable V. yT5a p 3.3 ?V

1-16 Operating the TI-80

To leave the keyboard uncluttered, the TI.80 uses full.screen menus to give you access to many additional operations. The use of specific menus is described in the appropriate chapters. Moving from One Menu to Another
Some menu keys, such as I, display more than one menu. The names of the menus appear on the top line. The current menu is highlighted and the items in that menu are displayed. Press 9 or 6 to move the cursor to a different menu.
The number of the current item is highlighted. If there are more than seven items on the menu, a $ appears on the last line in place of the : (colon) between the menu number and name. Menu items, such as VARS WINDOW, that end in. (ellipsis marks) display another menu. There are two methods of selecting from a menu.
Press the number of the item you want to select. Press 8 and 7 to move the cursor to the item you want to select, and then press.
Calculate 27. 1. Press I to display the MATH menu.
2. To select , you may either press 4 or press 8. 3. Enter 27, and then press to evaluate the expression.

Operating the TI-80 1-17

Leaving a Menu without Making a Selection
There are several ways to leave a menu without making a selection from the menu.
To return to the Home screen, press 2. To return to the screen where you were, press M. To display a different menu, press the appropriate key, such as *. To select another screen, press the appropriate key, such as ).

Using Fractions with Functions
Some math functions (+, , , , x, bc, abc, DEC) accept fractions as input values. All other functions convert fractions to decimals before operating on them. For more information about fractions, see Chapter 3.
Math, Angle, and Test Operations 2-3

Keyboard Math Operations

The most commonly used math functions are on the keyboard. The keyboard math operations can be used with decimal numbers, fractions (except as noted), expressions, and lists. + (Add) (Subtract) (Multiply) (Divide)
The basic arithmetic functions are: addition , subtraction |, multiplication p, and division e. Each argument for these functions can be a list. valueA+valueB, valueAvalueB, valueAvalueB, valueAvalueB

Trig Functions

The trigonometric functions are interpreted according to the current RADIAN/DEGREE mode setting. (Refer to page 1-9 for instructions on changing the mode setting.) For example, SIN 30 in RADIAN mode returns L.9880316241; in DEGREE mode, it returns.5. Each argument for the trigonometric functions may be a list.
SIN value, COS value, TAN value SIN, COS, and TAN are the inverse trig functions (arcsine,
arccosine, and arctangent).
SIN value, COS value, TAN value RADIAN Mode

(Inverse)

(inverse, V) may be used with numbers, expressions, or lists. The multiplicative inverse is the equivalent of the reciprocal, 1x.

value

2-4 Math, Angle, and Test Operations

^ (Power)

2 (Square)

(Square Root)

^ (power, Z), 2 (square, a), and (square root, 2 ]) may be used with decimal numbers, fractions, expressions, or lists. When used with a fraction, returns a decimal number.
value^power, value2, value Note: Raising a negative number to a noninteger power can result in a complex number, which returns an error.

LOG 10^ LN

These functions find the logarithm l, power of ten 2 h, and natural log x of the specified value or list of values.
LOG value, 10^power, LN value
e^ ( 2 s) returns the constant e raised to a power or list of powers. e^1 returns the value of the constant e. e^power
Math, Angle, and Test Operations 2-5

L (Negation)

L (negation, ) returns the negative of a number, expression, or list. The narrow negation symbol (L) distinguishes negation from the subtraction or minus (). Lvalue
EOS rules (Chapter 1) determine when negation is evaluated. For example, LA 2 returns a negative number because squaring is evaluated before negation. Use parentheses to square a negated number, (LA) 2.

of two values or the largest element in a list. If two lists are compared, it returns a list of the larger of each pair of elements. If a list and a value are compared, it compares each element in the list to the value.
MIN(valueA,valueB) MIN(list) MIN(listA,listB) MIN(value,list) MIN(list,value) MAX(valueA,valueB) MAX(list) MAX(listA,listB) MAX(value,list) MAX(list,value)
Note: MIN( and MAX( are also available on the LIST MATH menu.
REMAINDER( REMAINDER( (MATH NUM, item 7) returns the remainder
resulting from the division of two integers, each of which can be a list. (See INT, page 27.)
REMAINDER(valueA,valueB) REMAINDER(value,list) REMAINDER(listA,listB) REMAINDER(list,value)
If a list is used as one or both arguments, the result is a list of remainders.
Math, Angle, and Test Operations 2-11
MATH PRB (Probability) Operations
To display the MATH PRB menu, press I 6. When you select a menu item, the name is copied to the cursor location. Functions that are valid for lists return a list calculated on an element-by-element basis. MATH PRB Menu MATH NUM PRB 1: RAND 2: nPr 3: nCr 4: ! 5: RANDINT(
Random number generator. Number of permutations. Number of combinations. Factorial. Random integer generator.
RAND (random number, MATH PRB, item 1) generates and
returns a random number greater than 0 and less than 1 (as in the first example below). A random number is generated from a seed value. To control a random number sequence, first store an integer seed value in RAND. In the second example below, 1 is stored to RAND so that the TI-80 uses 1 as the seed value for generating random numbers.
Note: When you reset the TI-80, RAND is set to the factory seed value, which is 0.
2-12 Math, Angle, and Test Operations

nPr nCr

nPr (number of permutations, MATH PRB, item 2) returns the
number of permutations of items taken number at a time. items and number must be nonnegative integers. Both items and number can be lists.
nCr (number of combinations, MATH PRB, item 3) returns the number of combinations of items taken number at a time. items and number must be nonnegative integers. Both items and number can be lists.
items nPr number items nCr number

! (Factorial)

! (factorial, MATH PRB, item 4) returns the factorial of a
positive integer or list of integers between 0 and 69. value!

RANDINT(

RANDINT( (random integer, MATH PRB, item 5) generates a
random integer within a specified range. It requires two arguments: the lower and upper boundaries of the range (in any order). Both arguments must be integers. Both arguments can be negative. Both arguments can be lists.

RANDINT(lower,upper)

Math, Angle, and Test Operations 2-13

ANGLE Operations

To display the ANGLE menu, press 2 E. The ANGLE menu displays angle indicators and instructions. When you select an item from the menu, the name is copied to the cursor location. ANGLE Menu ANGLE 1: 2: r 3: R8Pr( 4: R8Pq( 5: P8Rx( 6: P8Ry(
Degree notation. Radian notation. Returns r, given X and Y. Returns q, given X and Y. Returns x, given R and q. Returns y, given R and q.

(Degree)

(degree, ANGLE, item 1) lets you designate an angle or list of
angles as degrees, regardless of the current angle mode setting. In RADIAN mode, can also be used to convert degrees to radians. value

RADIAN Mode

r (Radians)
r (radians, ANGLE, item 2) lets you designate an angle or list of angles as radians, regardless of the current angle mode setting. In DEGREE mode, r can also be used to convert radians to degrees.

valuer

DEGREE Mode
2-14 Math, Angle, and Test Operations

R8Pr ( R8Pq( P8Rx( P8Ry(

Note: When converting from one coordinate system to the other, be sure that the angle mode setting, DEGREE or RADIAN, is appropriate for your angle measurements. (Press 3 to check the current setting.)
R8Pr( (ANGLE, item 3) converts the given rectangular coordinates to polar coordinates and returns r. R8Pq( (ANGLE, item 4) converts the given rectangular coordinates to polar coordinates and returns q.
Both X and Y can be lists.
R8Pr(X,Y) R8Pq(X,Y) RADIAN Mode
P8Rx( (ANGLE, item 5) converts the given polar coordinates to rectangular coordinates and returns x. P8Ry( (ANGLE, item 6) converts the given polar coordinates to rectangular coordinates and returns y.
Both R and q can be lists.
P8Rx(R,q) P8Ry(R,q) RADIAN Mode
Math, Angle, and Test Operations 2-15
TEST (Relational) Operations
To display the TEST menu, press 2 D. When you select from the menu, the name is copied to the cursor location. These functions are valid for lists; they return a list calculated on an element-by-element basis. TEST Menu TEST 1:= 2: 3:> 4: 5:< 6:
True if: Equal. Not equal to. Greater than. Greater than or equal to. Less than. Less than or equal to.

= > <

Relational operators compare valueA and valueB and return 1 if the test is true or 0 if the test is false. valueA and valueB can be numbers, expressions, or lists. Relational operators are often used in programs to control program flow and in graphing to control the graph of a function over specific values. valueA=valueB valueAvalueB valueA>valueB valueAvalueB valueA<valueB valueAvalueB

To draw horizontal and vertical lines directly on a graph: 1. When a graph is displayed, select HORIZONTAL (item 3) or VERTICAL (item 4) from the DRAW DRAW menu. 2. A line is displayed that moves as you move the cursor. Position the cursor where you want to draw the line. Press. The line is drawn on the graph.
To continue to draw lines, repeat step 2. To cancel HORIZONTAL or VERTICAL, press M.
From the Home Screen or a Program HORIZONTAL (DRAW DRAW, item 3) draws a horizontal line at Y=Y (which can be an expression, but not a list). HORIZONTAL Y VERTICAL (DRAW DRAW, item 4) draws a vertical line at X=X (which can be an expression, but not a list). VERTICAL X
Note: In the example above, the horizontal line is drawn first, and then the vertical line is drawn.

Draw Operations 7-5

Drawing a Function
DRAWF (draw function) draws a function on the current graph. DRAWF must be entered on the Home screen or in the program editor. Drawing a Function DRAWF (draw function, DRAW DRAW, item 5) is not an
interactive operation. It draws the specified expression as a function in terms of X on the current graph.

DRAWF expression

For example, if Y1=.2X2X+6 is the only selected function, DRAWF Y15 plots Y1 and then draws the function Y15 when you press.
Note: You cannot trace on DRAWF functions.
Using GRIDON and GRIDOFF GRIDON (DRAW DRAW, item 9) and GRIDOFF (DRAW DRAW, item 0) set graphs to be drawn with the grid
points on or off, respectively. The grid points correspond to the axes tick marks. The default for the TI-80 is GRIDOFF. 1. From the Home screen, press 2 F to display the DRAW menu. 2. Press 9 to select GRIDON, or press 0 to select GRIDOFF. 3. Press. The message DONE is displayed. The next time the graph is displayed, the grid points will be on if you selected GRIDON, or off if you selected GRIDOFF.

7-6 Draw Operations

Shading Areas on a Graph
There are three shading instructions on the DRAW DRAW menu: SHADE_Y>, SHADE_Y<, and SHADE(. These instructions are not interactive; they must be entered on the Home screen or in the program editor. Shading Areas above a Function SHADE_Y> (DRAW DRAW, item 6) takes up to four arguments (functions of X). SHADE_Y>function SHADE_Y>function1,. ,function4

SORTA(listname) SORTA(keylistname,dependlistA,dependlistB,.) SORTD(listname) SORTD(keylistname,dependlistA,dependlistB,.)

CLRLIST

CLRLIST (clear list, STAT EDIT, item 4) clears (deletes) the elements of one or more lists. CLRLIST listnameA,listnameB,.

Statistics 9-13

Statistical Analysis
Pressing A 9 accesses the STAT CALC menu, where you select and perform statistical calculations. The TI-80 can analyze one-variable or two-variable statistics. Both can have associated frequency lists. STAT CALC Menu
EDIT CALC 1: 1-VAR STATS 2: 2-VAR STATS 3: LINREG(aX+b) 4: QUADREG 5: LINREG(a+bX) 6: LNREG 7: EXPREG 8: PWRREG
Calculates 1-variable statistics. Calculates 2-variable statistics. Fits data to linear model. Fits data to quadratic model. Fits data to linear model. Fits data to logarithmic model. Fits data to exponential model. Fits data to power model.
Selecting and Performing a Statistical Calculation
To select and perform statistical calculations: 1. Select a calculation type by pressing its corresponding number on the STAT CALC menu. The name of the calculation is copied to the Home screen. 2. Enter the name(s) of the list(s) to be used in the calculation. If you enter more than one list name, separate them by commas. 3. Press to perform the calculation and display the results.
Frequency of Occurrence for Data Points
For all of the calculation types, you can include a list of data occurrences, or frequencies. These indicate how many times the corresponding data points or data pairs occur in the data set you are analyzing. For example, if L1={15.5,12.1,9.8,14.7,15} and L2={1,4,1,3,3}, then the instruction 1-VAR STATS L1,L2 would assume that 15.5 occurred one time, 12.1 occurred four times, 9.8 occurred one time, and so on. Frequencies must be greater than or equal to zero. At least one frequency in the list must be greater than zero. Noninteger frequencies are valid. This is useful in entering frequencies expressed as percentages or parts that add up to 1. Noninteger frequencies, however, may prevent the calculation of certain variables.

9-14 Statistics

Types of Statistical Analysis

4. Press = 3 2. This sets the dimension of L (the list where the results of the rolls will be stored) to 0. Press to complete the instruction and move to the next line.
5. Press K to copy INPUT to the cursor location. Press 2 < " ROLLS 2 D 1 ? " b ? R to prompt the user to input the number of rolls. Press to complete the instruction. 6. Press K 4 to copy FOR( to the cursor location. Press ? I b 1 b ? R b 1 d. Press to complete the instruction.

10-2 Programming

7. Press I 6 to access the MATH PRB menu. Press 5 (to copy RANDINT( to the cursor location) 1 b 6 d 2 c ? I d to generate random integers from 1 to 6 and store them into element I of L1. Press to complete the instruction. 8. Press K to select DISP (display), which is copied to the cursor location. Press 2 c ? I d. This instruction displays the value of element I (the result of the last roll) in L1. Press to complete the instruction. 9. Press K 6 to select PAUSE, which is copied to the cursor location. This pauses the program after displaying the result of the last roll. Press to complete the instruction.
10. Press K 5 to select END, which is copied to the cursor location. END identifies the end of the group of commands in the FOR( loop. Press to complete the instruction.
11. Press K 2 to display the list of all the roll results. Press to complete the instruction. 12. Press 2. M K. Move the cursor to the program name ROLL. Press. Press again from the Home screen to execute PRGM_ROLL.

Programming 10-3

About TI-80 Programs
Most features of the TI.80 are accessible from programs. Programs can access all variables and named items. The number of programs that the TI.80 can store is limited only by available memory. Notes about Programs
Programs are identified by names of up to seven characters, beginning with a letter. A program consists of a series of program commands, which begin with a : (colon). A program command can be an expression (a command, usually a combination of variables, functions, and numeric values, that returns a value to ANS) or an instruction (a command, such as GRIDON or PT-ON(, that does not return a value to ANS). The TI-80 checks for errors when you execute the program, not as you enter or edit the program. Variables and lists saved in memory are global; that is, they can be accessed from all programs. Storing a new value to a variable or list in a program changes the value in memory during program execution. As calculations are made in programs, the TI-80 updates ANS, just as it would if the calculations were done on the Home screen. Programs do not update Last Entry as each command is executed.

Input initial guess. Begin loop. Calculate new root.
Test for convergence. Estimate with new root.
Follow this procedure to solve the problem. 1. Press 3 and select FUNC. 2. Enter the program. 3. Press (. Enter the expression e3X to define Y1.
4. Graph the function using ZDECIMAL from the ZOOM menu.

11-4 Applications

5. Press + and move the cursor close to the left root. The variables X and Y are updated as you move the cursor.
6. From a blank line on the Home screen, execute the program NEWTON. 7. Enter X as the initial guess, and press repeatedly. The program stops when the relative difference between the new root estimate and the previous root estimate is less than XL10.
8. When program execution is complete, evaluate the function at the estimated root.
Repeat the steps in this procedure to find the other root.

Applications 11-5

Program: Numerical Integration
This program uses Simpsons method to estimate the definite integral of a function. Problem
Estimate the definite integral of

1.5(66x )dx

and graph the area of the integral.

Program

The program estimates the definite integral for Y1 using Simpsons method. It prompts for the lower and upper limits of integration and the number of divisions.
PROGRAM:SIMPSON :INPUT "LOWER LIMIT=",A :INPUT "UPPER LIMIT=",B :INPUT "N DIVISIONS=",D :0S :(B A)/(2D)W :FOR(J,1,D,1) :A+2(J 1)WL :A+2JWR :(L+R)/2M :W(Y1(L)+4Y1(M)+Y1(R)) /3+SS :END :DISP "AREA=" :DISP S
Input lower limit. Input upper limit. Input # of divisions. Initialize sum variable. Calculate division width. Begin calculation loop. Calculate left point. Calculate right point. Calculate midpoint. Calculate division sum and add to total. Display results.
Follow this procedure to solve the problem. 1. Enter the program. 2. Press ( and enter the function in Y1. Turn any other functions off.

11-6 Applications

3. Set the Window variables.
4. Execute the program SIMPSON from a clear Home screen, entering the limits and divisions as you are prompted.

Memory Management 12-3

Resetting the TI-80
Resetting the TI.80 restores memory to the factory settings, including deleting the contents of all variables and programs and resetting all system variables to the original settings. Because you can increase available memory by deleting individual items, you should rarely need to reset the TI.80. Resetting
To reset the TI-80: 1. Press 2 to display the MEMORY menu. 2. Press 3 to select RESET.
3. Make the appropriate menu selection: To go to the Home screen without resetting memory, select NO. To reset memory, select RESET. The Home screen is displayed with the message MEM CLEARED.
Note: If the screen is blank after RESET, adjust the display contrast. Press 2 and then press and hold 7 (to make the display darker) or (to make the display lighter). You can press M to clear the message on the display.

12-4 Memory Management

Appendix A: Tables and Reference Information
This appendix provides a list of all TI-80 functions that you can use in expressions and instructions that you can use on the Home screen and in programs. It also includes other reference information that can help you. Appendix Contents
Table of TI-80 Functions and Instructions.. A-2 Menu Map.. A-20 TI-80 Variables.. A-26
Tables and Reference Information A-1
Table of TI-80 Functions and Instructions
A function (F) returns a value or a list and can be used in expressions; an instruction (I) initiates an action. Some, but not all, have arguments. indicates that the instruction is available for copying only from the program editor.
Sets the display format for 3 abc fraction results to abc (mixed fraction) mode. (I) Returns value as a mixed fraction. (F) J 4abc

1-11 3-9 2-6

valueabc

ABS value ABS list

Returns the absolute value 2 P of value. (F) Returns a list of absolute 2 P values for each element in list. (F) Returns valueA plus valueB. (F)

2-6 2-4

Addition: valueA+valueB Addition: value+list
Returns a list in which value is added to each list element. (F) Returns a list of listA elements plus listB elements. (F) Turns on automatic simplification mode for fractions. (I)

Addition: listA+listB

2-AUTOSIMP 1-11

AUTOSIMP

Sets the display format for 3 bc fraction results to bc (simple fraction) mode. (I) Returns value as a simple J 4bc fraction. (F) Deletes all drawn elements from a graph or drawing. (I) Clears the Home screen. (I) 2 F DRAW CLRDRAW

1-11 3-9

value8bc

CLRDRAW

7-12 K I/O CLRHOME 10-13 9-13

L SIMPFACTOR SIMPFACTOR 1:FACTOR
L STATISTICS BOX EQ G X/Y 1:Q 1:a 1:GX 1:n 2:MED 2:b 2:GX 2:v 3:Q 3:c 3:GY 3:Sx 4:r 4:GY 4:sx 5:REGEQ 5:GXY 5:w 6:Sy 7:sy 8:MINX 9:MAXX 0:MINY A:MAXY 2G XT/YT ON/OFF Y 1:XT 1:FNON 1:Y1 2:FNOFF 2:YT 2:Y2 3:Y3 3:XT 4:Y4 4:YT 3:XT 4:YT
A-24 Tables and Reference Information
2 MEMORY 1:CHECK RAM 2:DELETE 3:RESET
2 CHECK RAM MEM FREE 7014 REAL 14 LIST 0 Y-VARS 80 PRGM 14
2 DELETE DELETE: name memory name memory name memory (names include defined programs, lists, Y= equations, and user variables, in that order.)
2 RESET 1:NO 2:RESET Resetting memory erases all data and programs.
Tables and Reference Information A-25

TI-80 Variables

The variables listed below are used by the TI-80 in various ways. Some have restrictions on their use. User Variables
The variables A through Z and q can hold only numbers either decimals or fractions. You may store to these variables. The TI-80 can update X, Y, and T during graphing; therefore, you may wish to reserve those variables for graphing activities. The variables L through L6 are defined as lists. You cannot store another type of data to them. You can store any string of characters, functions, instructions, or variable names to the functions Yn (in FUNC mode) and Xn and Yn (in PARAM mode), by using either or the Y= editor. The validity of the string is determined when the function is evaluated.

System Variables

The values of the Window variablesXMIN, XMAX, XSCL, @X, TSTEP, etc.must be real numbers. You may store to them. Since the TI-80 can update some of them, as the result of a Zoom instruction, for example, you may wish to reserve these variables for graphing activities. The statistical result variablesn, v, MINX, GX, a, r, REGEQ, X1, Y1, Q1, MED, Q3, etc.are reserved for use by the TI-80. You cannot store to them.
A-26 Tables and Reference Information
Appendix B: Service and Warranty Information
This appendix provides supplemental information that may be helpful as you use the TI.80. It includes procedures that may help you correct problems with the calculator. Appendix Contents
Battery Information. Accuracy Information.. In Case of Difficulty. Error Conditions.. Service and Support Information. Warranty Information..
B-2 B-8 B-10 B-11 B-14 B-15
Service and Warranty Information B-1

Battery Information

The TI.80 uses two CR2032 lithium 3-volt batteries. When to Replace the Batteries
As you use the TI.80, the battery voltage will gradually drop, and the display will dim. You can adjust the contrast to darken the display when this happens. If the display is dim and adjusting the contrast to level 9 does not make it dark enough, you should replace the batteries. Refer to pages B-3 through B-7 for instructions on how to change the batteries. Follow these safety guidelines concerning batteries.

B-10 Service and Warranty Information
When the TI.80 detects an error, it displays ERR:message and the error menu. The general procedure for correcting errors is described on page 1.22. The error messages, their possible causes, and suggestions for correction are shown below.

ARGUMENT BREAK DATA TYPE

A function or instruction does not have the correct number of arguments. See Appendix A and the appropriate chapter. You have pressed the key to break execution of a program, halt a Draw instruction, or stop evaluation of an expression. You have entered a value or variable that is the wrong data type. A function (including implied multiplication) or an instruction has an argument that is an invalid data type; for example, a list where a real number is required. See Appendix A and the appropriate chapter. You are attempting to store to an incorrect data type; for example, a list to a real variable. In function graphing or parametric graphing, you have generated a list result rather than a single value; for example, attempting to graph Y={1,2,3}X. You are attempting to perform an operation that uses more than one list, but the dimensions do not match. Typically, this occurs when the value of an argument does not fall within a specified range. You are attempting to divide by zero. You are attempting a logarithmic or power regression with a LX or an exponential or power regression with a LY. A zero value for for NDERIV( will result in this error. This error does not occur during graphing because the TI-80 allows for undefined values on a graph.

DIM MISMATCH DOMAIN

Service and Warranty Information B-11

INCREMENT

INVALID
The increment in SEQ( is 0 or has the wrong sign. This error does not occur during graphing. The TI-80 allows for undefined values on a graph. The increment in FOR( is 0 or has the wrong sign.
You are attempting to reference a variable or use a function in a place where it is not valid. For example, Yn cannot reference Y, XMIN, @X, or TBLMIN.

INVALID DIM

The dimension of the argument is not appropriate for the operation. List element dimensions must be integers between 1 and 99; for example, L1(100) will cause an error.

Service and Warranty Information
8299APPB.DOC TI-82, Appendix B, English Bob Fedorisko Revised: 02/27/01 12:20 PM Printed: 02/27/01 12:25 PM Page 12 of 13
Australia & New Zealand Customers only
One-Year Limited Warranty for Commercial Electronic Product This Texas Instruments electronic product warranty extends only to the original purchaser and user of the product. Warranty Duration. This Texas Instruments electronic product is warranted to the original purchaser for a period of one (1) year from the original purchase date. Warranty Coverage. This Texas Instruments electronic product is warranted against defective materials and construction. This warranty is void if the product has been damaged by accident or unreasonable use, neglect, improper service, or other causes not arising out of defects in materials or construction. Warranty Disclaimers. Any implied warranties arising out of this sale, including but not limited to the implied warranties of merchantability and fitness for a particular purpose, are limited in duration to the above one-year period. Texas Instruments shall not be liable for loss of use of the product or other incidental or consequential costs, expenses, or damages incurred by the consumer or any other user. Some jurisdictions do not allow the exclusion or limitation of implied warranties or consequential damages, so the above limitations or exclusions may not apply to you. Legal Remedies. This warranty gives you specific legal rights, and you may also have other rights that vary from jurisdiction to jurisdiction. Warranty Performance. During the above one (1) year warranty period, your defective product will be either repaired or replaced with a new or reconditioned model of an equivalent quality (at TIs option) when the product is returned to the original point of purchase. The repaired or replacement unit will continue for the warranty of the original unit or six (6) months, whichever is longer. Other than your cost to return the product, no charge will be made for such repair and/or replacement. TI strongly recommends that you insure the product for value if you mail it. Software. Software is licensed, not sold. TI and its licensors do not warrant that the software will be free from errors or meet your specific requirements. All software is provided AS IS. Copyright. The software and any documentation supplied with this product are protected by copyright.
All Customers Outside the U.S. and Canada
For information about the length and terms of the warranty, refer to your package and/or to the warranty statement enclosed with this product, or contact your local Texas Instruments retailer/distributor.
B-16 Service and Warranty Information
8299APPB.DOC TI-82, Appendix B, English Bob Fedorisko Revised: 02/27/01 12:20 PM Printed: 02/27/01 12:25 PM Page 13 of 13

D (Cont.)

Display (Cont.) graph, 4-11, 4-12 Home screen, 1-4 table, 6-5, 6-6 text, 10-12, 10-13, A-3, A-7 Division: , 2-4, A-4 DOMAIN error, B-11 DOT MODE, 1-9, 1-11, 4-4, A-4 DRAW menu, 7-3 to 7-11 DRAWF, 7-3, 7-6, A-4 Drawing function, 7-6 lines, 7-4 to 7-5 on a graph, 7-1 to 7-11 points, 7-10 stat data, 9-18 to 9-21
DATA TYPE error, B-11 8DEC, 2-7, 2-8, 3-8, 3-10, 8-2, A-3 Decimal display, 1-10, 2-8, A-3 Decimal window, 4-15, 4-17, A-19 DEGREE MODE, 1-9, 1-11, 2-14, 4-4, A-3 Degree notation , 2-14, A-3 Deleting characters, 1-8 from memory, 12-3 @TBL variable, 6-2, 6-3, 6-5, 6-6 @X, @Y, 4-10, 4-17, A-26, B-8 Dependent variable, 6-4 to 6-6 Derivative. See Numerical derivative Difficulty, in case of, B-10 DIM, 8-6, 8-7, A-3 Dimension (list), 8-6, 8-7, A-3 DIM MISMATCH error, B-11 DISP, 10-3, 10-11, 10-13, A-3 DISPGRAPH, 9-24, 10-11, 10-13, A-3 Display, 1-4, 1-5 contrast, 3, 1-3, B-2, B-10 cursors, 1-5, 1-8 decimal, 2-8, A-3 fraction, 3-8, 3-10, A-6
H, 2-9 e^, 2-5, A-4, B-9 e (natural log), 2-5, A-8, B-9 Edit keys, 1-8 Editors, 1-8 function, 4-5, 4-6, 5-3 list, 9-9 to 9-12 program, 10-5 to 10-7, 10-14 statistics, 9-9 to 9-12 table, 6-3 to 6-6 Y=, 4-5, 4-6, 5-3 Element list, 8-3 to 8-5 ELSE, 10-7, 10-8, A-4 END, 10-3, 10-7 to 10-9, A-4 Entering expressions, 1-6 fractions, 3-6 functions, 1-7, 4-5 to 4-7, 5-3, 6-4, A-26 lists, 8-3 to 8-5, 9-10 to 9-12 negative numbers, 1-21, 2-6, A-11 programs, 10-5 to 10-6 statistics, 9-2 to 9-24 EOS, 1-20, 1-21 EQ (VARS) menu, 1-19, 9-17 Equal: =, 2-16, A-4

I-2 Index

E (Cont.)
Equation Operating System, 1-20, 1-21 Equations, parametric, 5-2 to 5-6 Erasing a program, 10-4, 12-3 Errors, 1-22, 8-5, 10-4, B-11 to B-13 Evaluating expressions, 1-6, 3-4 Evaluating functions, 4-7 Executing programs, 10-5 Exponent: E, 1-7, A-4 Exponential regression, 9-14, 9-16, A-5 EXPREG, 9-14, 9-16, A-5 Expressions, x, 1-6
Getting Started. See Applications Glossary, x GOTO, 10-7, 10-10, A-6, B-12 Graph accuracy, 4-12, B-8 defining, 4-3, 5-3 displaying, 12, 4-11, 5-5 mode, 1-9, 4-4 parametric, 5-1 to 5-6 Greater than: >, 2-16, A-6 Greater than or equal: , 2-16, A-6 Greatest integer, 2-10, A-7 GRIDOFF, GRIDON, 4-11, 7-6, A-6 Guidebook, using, viii to ix
F (frequency), 9-19, 9-20 Factorial:!, 2-12, 2-13, A-5, B-9 Features, 14 FIX MODE, 1-9, 1-10, A-5 FLOAT MODE, 1-9, 1-10, A-5 FNOFF, FNON, 4-8, A-5 FOR(, 10-9, A-5 FPART, 2-10, A-6 FRACTION menu, 3-8, 3-10 Fractional part, 2-10, A-6 Fractions converting, 3-8 to 3-10 entering, 3-6 in expressions, 3-5 mixed, 3-6 modes, 3-4, 34-8, 3-5 simple, 3-6 simplifying, 3-8 8FRAC, 3-10, A-6 Free-moving cursor, 4-12, 5-6 Frequency, 9-19, 9-20 FUNC MODE, 1-9, 1-11, 4-4, 7-3, A-6 Functions, x, 1-6, 1-7, 2-3, B-9 clearing, 4-6 editing, 4-6 entering, 4-7 defining, 4-5, 4-6, 5-3 evaluating, 4-7 graphing, 4-2 to 4-18 parametric, 5-2 to 5-6 selecting, 4-8, 5-4