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Texas Instruments TI-80 User Manual - Page 90

is still turned on. To zoom in on the graph again, At the same point, press

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ZOOM IN ZOOM OUT ZOOM IN magnifies the graph around the cursor location. The XFACT and YFACT settings determine the extent of the zoom (page 4-18). The default value for both XFACT and YFACT is 4. 1. After checking or changing XFACT and YFACT, select ZOOM IN from the ZOOM menu. Notice the different cursor. It indicates that you are using a Zoom instruction. 2. Move the cursor to the point that you want as the center of the new viewing window, and then press ¸. The TI-80 adjusts the viewing window by XFACT and YFACT, updates the Window variables, and replots the selected functions centered on the cursor location. 3. ZOOM IN is still turned on. To zoom in on the graph again: ¦ At the same point, press ¸. ¦ At a new point, move the cursor to the point that you want as the center of the new viewing window, and then press ¸. ZOOM OUT displays a greater portion of the graph, centered on the cursor location, to provide a more global view. The procedure for ZOOM OUT is the same as for ZOOM IN. Leaving ZOOM IN or ZOOM OUT To leave ZOOM IN or ZOOM OUT: ¦ Select another screen by pressing the appropriate key, such as + or ,. ¦ Press 2 . to return to the Home screen. 4-16 Function Graphing

Section	Page
TI-80 Graphing Calculator Guidebook	1
Important and FCC Information	2
Table of Contents	3
Using this Guidebook Effectively	8
Glossary	11
Getting Started: Do This First!	13
TI-80 Keyboard	14
First Steps	15
TI-80 Menus	16
Entering a Calculation: Compound Interest	17
Continuing a Calculation	18
Defining a Function: Box with Lid	19
Defining a Table of Values	20
Zooming In on the Table	21
Changing the Viewing Window	23
Displaying and Tracing the Graph	24
Zooming In on the Graph	25
Other TI-80 Features	26
Chapter 1: Operating the TI-80	27
Turning the TI-80 On and Off	28
Setting the Display Contrast	29
The Display	30
Entering Expressions and Instructions	32
The Edit Keys	34
Setting Modes	35
TI-80 Modes	36
Variable Names	38
Storing and Recalling Variable Values	39
Last Entry	40
Last Answer	42
TI-80 Menus	43
The VARS and Y.VARS Menus	45
EOS (Equation Operating System)	46
Error Conditions	48
Chapter 2: Math, Angle, and Test Operations	49
Getting Started: Lottery Chances	50
Using the TI-80 Functions	51
Keyboard Math Operations	52
MATH MATH Operations	55
MATH NUM (Number) Operations	58
MATH PRB (Probability) Operations	60
ANGLE Operations	62
TEST (Relational) Operations	64
Chapter 3: Fractions	65
Getting Started: Working with Fractions	66
Setting Modes for Fraction Results	68
Entering and Using Fractions in Calculations	70
The FRACTION Menu	72
Chapter 4: Function Graphing	75
Getting Started: Graphing a Circle	76
Defining a Graph	77
Setting Graph Modes	78
Defining Functions in the Y= List	79
Evaluating Y= Functions in Expressions	81
Selecting Functions	82
Defining the Viewing Window	83
Displaying a Graph	85
Exploring a Graph with the Free-Moving Cursor	86
Exploring a Graph with TRACE	87
Exploring a Graph with ZOOM	89
Setting the Zoom Factors	92
Chapter 5: Parametric Graphing	93
Getting Started: Path of a Ball	94
Defining and Displaying a Parametric Graph	95
Exploring a Parametric Graph	98
Chapter 6: Tables	99
Getting Started: Roots of a Function	100
Defining the Independent Variable	101
Defining the Dependent Variable	102
Displaying the Table	103
Chapter 7: Draw Operations	105
Getting Started: Shading a Graph	106
DRAW DRAW Menu	107
Drawing Lines	108
Drawing Horizontal and Vertical Lines	109
Drawing a Function	110
Shading Areas on a Graph	111
Drawing Points	114
Clearing a Drawing	116
Chapter 8: Lists	117
Getting Started: Generating a Sequence	118
About Lists	119
LIST OPS Operations	122
LIST MATH Operations	125
Chapter 9: Statistics	127
Getting Started: Building Height and City Size	128
Setting Up a Statistical Analysis	134
The STAT List Editor	135
Viewing, Entering, and Editing Lists	136
Sorting and Clearing Lists	139
Statistical Analysis	140
Types of Statistical Analysis	141
Statistical Variables	143
Statistical Plotting	144
Statistical Analysis in a Program	148
Statistical Plotting in a Program	149
Chapter 10: Programming	151
Getting Started: Rolling a Die	152
About TI-80 Programs	154
Creating and Executing Programs	155
Editing Programs	156
PRGM CTL (Control) Instructions	157
PRGM I/O (Input/Output) Instructions	161
Calling Other Programs	164
Chapter 11: Applications	165
Probability Experiments: Coins, Dice, and Spinners	166
The Unit Circle and Trigonometric Curves	167
Program: Newton’s Numerical Solve Routine	168
Program: Numerical Integration	170
Program: Window Variables Store and Recall	172
Graphing the Inverse of a Function	174
Graphing a Piecewise Function	176
Graphing Inequalities	178
Graphing a Polar Equation	179
Program: Guess the Coefficients	180
Chapter 12: Memory Management	181
Checking Available Memory	182
Deleting Items from Memory	183
Resetting the TI-80	184
Appendix A: Tables and Reference Information	185
Table of TI-80 Functions and Instructions	186
A, B, C	186
D	187
E	188
F	189
G	190
H, I	191
L	192
M	193
N	194
O, P	195
Q, R	198
S	200
T	202
V, Z	203
TI-80 Menu Map	204
TI-80 Variables	210
Appendix B: Service and Warranty Information	211
Battery Information	212
Accuracy Information	218
In Case of Difficulty	220
Error Conditions	221
Support and Service Information	224
Product Support	224
Product Service	224
Other TI Products and Services	224
Warranty Information	225
Customers in the U.S. and Canada Only	225
Australia & New Zealand Customers only	226
All Customers Outside the U.S. and Canada	226
Index	227
A, B, C	227
D, E	228
F, G, H, I	229
K, L, M	230
N, O, P, Q, R	231
S, T	232
U, V, W, X, Y, Z	233
TI-80 Calculator	234
Line drawing	234