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Texas Instruments TI-84 PLUS Guidebook - Page 197

Detaching Formulas from List Names, Switching Stat List Editor Contexts - how to make a less than symbol

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source of the error. After making the appropriate changes, you can reattach the formula to a list. • If you do not want to clear the formula, you can select 1:Quit, display the referenced list on the home screen, and find and edit the source of the error. To edit an element of a list on the home screen, store the new value to listname(element#) (Chapter 11). Detaching Formulas from List Names Detaching a Formula from a List Name You can detach (clear) a formula from a list name in several ways. For example: • In the stat list editor, move the cursor onto the name of the list to which a formula is attached. Press Í ' Í. All list elements remain, but the formula is detached and the lock symbol disappears. • In the stat list editor, move the cursor onto an element of the list to which a formula is attached. Press Í, edit the element, and then press Í. The element changes, the formula is detached, and the lock symbol disappears. All other list elements remain. • Use ClrList. All elements of one or more specified lists are cleared, each formula is detached, and each lock symbol disappears. All list names remain. • Use ClrAllLists (Chapter 18). All elements of all lists in memory are cleared, all formulas are detached from all list names, and all lock symbols disappear. All list names remain. Editing an Element of a Formula-Generated List As described above, one way to detach a formula from a list name is to edit an element of the list to which the formula is attached. The TI-84 Plus protects against inadvertently detaching the formula from the list name by editing an element of the formula-generated list. Because of the protection feature, you must press Í before you can edit an element of a formula-generated list. The protection feature does not allow you to delete an element of a list to which a formula is attached. To delete an element of a list to which a formula is attached, you must first detach the formula in any of the ways described above. Switching Stat List Editor Contexts Stat List Editor Contexts The stat list editor has four contexts. • View-elements context • View-names context Chapter 12: Statistics 190

Section	Page
Important Information	2
Chapter 1: Operating the TI-84 Plus Silver Edition	8
Documentation Conventions	8
TI-84 Plus Keyboard	8
Turning On and Turning Off the TI-84 Plus	10
Setting the Display Contrast	11
The Display	12
Interchangeable Faceplates	15
Using the Clock	16
Entering Expressions and Instructions	18
Setting Modes	21
Using TI-84 Plus Variable Names	26
Storing Variable Values	27
Recalling Variable Values	28
Scrolling Through Previous Entries on the Home Screen	29
ENTRY (Last Entry) Storage Area	29
TI-84 Plus Menus	32
VARS and VARS Y-VARS Menus	34
Equation Operating System (EOS™)	36
Special Features of the TI-84 Plus	37
Other TI-84 Plus Features	38
Error Conditions	40
Chapter 2: Math, Angle, and Test Operations	42
Getting Started: Coin Flip	42
Keyboard Math Operations	43
MATH Operations	45
Using the Equation Solver	49
MATH NUM (Number) Operations	52
Entering and Using Complex Numbers	57
MATH CPX (Complex) Operations	61
MATH PRB (Probability) Operations	63
ANGLE Operations	66
TEST (Relational) Operations	69
TEST LOGIC (Boolean) Operations	70
Chapter 3: Function Graphing	72
Getting Started: Graphing a Circle	72
Defining Graphs	73
Setting the Graph Modes	74
Defining Functions	75
Selecting and Deselecting Functions	76
Setting Graph Styles for Functions	78
Setting the Viewing Window Variables	80
Setting the Graph Format	81
Displaying Graphs	83
Exploring Graphs with the Free-Moving Cursor	85
Exploring Graphs with TRACE	85
Exploring Graphs with the ZOOM Instructions	87
Using ZOOM MEMORY	92
Using the CALC (Calculate) Operations	94
Chapter 4: Parametric Graphing	98
Getting Started: Path of a Ball	98
Defining and Displaying Parametric Graphs	100
Exploring Parametric Graphs	102
Chapter 5: Polar Graphing	104
Getting Started: Polar Rose	104
Defining and Displaying Polar Graphs	105
Exploring Polar Graphs	107
Chapter 6: Sequence Graphing	109
Getting Started: Forest and Trees	109
Defining and Displaying Sequence Graphs	110
Selecting Axes Combinations	114
Exploring Sequence Graphs	114
Graphing Web Plots	116
Using Web Plots to Illustrate Convergence	117
Graphing Phase Plots	118
Comparing TI-84 Plus and TI-82 Sequence Variables	120
Keystroke Differences Between TI-84 Plus and TI-82	121
Chapter 7: Tables	122
Getting Started: Roots of a Function	122
Setting Up the Table	123
Defining the Dependent Variables	124
Displaying the Table	125
Chapter 8: Draw Instructions	128
Getting Started: Drawing a Tangent Line	128
Using the DRAW Menu	129
Clearing Drawings	130
Drawing Line Segments	131
Drawing Horizontal and Vertical Lines	132
Drawing Tangent Lines	133
Drawing Functions and Inverses	134
Shading Areas on a Graph	135
Drawing Circles	135
Placing Text on a Graph	136
Using Pen to Draw on a Graph	137
Drawing Points on a Graph	138
Drawing Pixels	139
Storing Graph Pictures (Pic)	141
Recalling Graph Pictures (Pic)	142
Storing Graph Databases (GDB)	142
Recalling Graph Databases (GDB)	143
Chapter 9: Split Screen	144
Getting Started: Exploring the Unit Circle	144
Using Split Screen	145
Horiz (Horizontal) Split Screen	146
G-T (Graph-Table) Split Screen	147
TI-84 Plus Pixels in Horiz and G-T Modes	148
Chapter 10: Matrices	150
Getting Started: Using the MTRX Shortcut Menu	150
Getting Started: Systems of Linear Equations	151
Defining a Matrix	152
Viewing and Editing Matrix Elements	153
Using Matrices with Expressions	155
Displaying and Copying Matrices	156
Using Math Functions with Matrices	158
Using the MATRX MATH Operations	161
Chapter 11: Lists	168
Getting Started: Generating a Sequence	168
Naming Lists	169
Storing and Displaying Lists	170
Entering List Names	171
Attaching Formulas to List Names	172
Using Lists in Expressions	174
LIST OPS Menu	175
LIST MATH Menu	182
Chapter 12: Statistics	185
Getting Started: Pendulum Lengths and Periods	185
Setting Up Statistical Analyses	191
Using the Stat List Editor	192
Attaching Formulas to List Names	195
Detaching Formulas from List Names	197
Switching Stat List Editor Contexts	197
Stat List Editor Contexts	199
STAT EDIT Menu	200
Regression Model Features	202
STAT CALC Menu	205
Statistical Variables	213
Statistical Analysis in a Program	214
Statistical Plotting	215
Statistical Plotting in a Program	219
Chapter 13: Inferential Statistics and Distributions	222
Getting Started: Mean Height of a Population	222
Inferential Stat Editors	225
STAT TESTS Menu	228
Inferential Statistics Input Descriptions	246
Test and Interval Output Variables	247
Distribution Functions	248
Distribution Shading	255
Chapter 14: Applications	258
The Applications Menu	258
Getting Started: Financing a Car	259
Getting Started: Computing Compound Interest	260
Using the TVM Solver	260
Using the Financial Functions	261
Calculating Time Value of Money (TVM)	262
Calculating Cash Flows	264
Calculating Amortization	265
Calculating Interest Conversion	268
Finding Days between Dates/Defining Payment Method	268
Using the TVM Variables	269
The EasyData™ Application	270
Chapter 15: CATALOG, Strings, Hyperbolic Functions	273
Browsing the TI-84 Plus CATALOG	273
Entering and Using Strings	274
Storing Strings to String Variables	275
String Functions and Instructions in the CATALOG	276
Hyperbolic Functions in the CATALOG	280
Chapter 16: Programming	282
Getting Started: Volume of a Cylinder	282
Creating and Deleting Programs	283
Entering Command Lines and Executing Programs	285
Editing Programs	286
Copying and Renaming Programs	287
PRGM CTL (Control) Instructions	288
PRGM I/O (Input/Output) Instructions	295
Calling Other Programs as Subroutines	300
Running an Assembly Language Program	301
Chapter 17: Activities	303
The Quadratic Formula	303
Box with Lid	306
Comparing Test Results Using Box Plots	313
Graphing Piecewise Functions	315
Graphing Inequalities	316
Solving a System of Nonlinear Equations	317
Using a Program to Create the Sierpinski Triangle	318
Graphing Cobweb Attractors	319
Using a Program to Guess the Coefficients	320
Graphing the Unit Circle and Trigonometric Curves	322
Finding the Area between Curves	323
Using Parametric Equations: Ferris Wheel Problem	324
Demonstrating the Fundamental Theorem of Calculus	326
Computing Areas of Regular N-Sided Polygons	328
Computing and Graphing Mortgage Payments	330
Chapter 18: Memory and Variable Management	333
Checking Available Memory	333
Deleting Items from Memory	336
Clearing Entries and List Elements	336
Archiving and UnArchiving Variables	337
Resetting the TI-84 Plus	340
Grouping and Ungrouping Variables	343
Garbage Collection	346
ERR:ARCHIVE FULL Message	350
Chapter 19: Communication Link	351
Getting Started: Sending Variables	351
TI-84 Plus LINK	352
Selecting Items to Send	354
Receiving Items	357
Backing Up RAM Memory	358
Error Conditions	359
Appendix A: Functions and Instructions	361
Appendix B: Reference Information	390
Variables	390
Statistics Formulas	391
Financial Formulas	394
Important Things You Need to Know About Your TI-84 Plus	398
Error Conditions	401
Accuracy Information	405
Appendix C: Service and Warranty Information	407
Texas Instruments Support and Service	407
Battery Information	407

Match case Limit results 1 per page

Chapter 12: Statistics

190

source of the error. After making the appropriate changes, you can reattach the formula to a

list.

•

If you do not want to clear the formula, you can select

1:Quit

, display the referenced list on the

home screen, and find and edit the source of the error. To edit an element of a list on the home

screen, store the new value to

listname

(

element#

)

(Chapter 11).

Detaching Formulas from List Names

Detaching a Formula from a List Name

You can detach (clear) a formula from a list name in several ways.

For example:

•

In the stat list editor, move the cursor onto the name of the list to which a formula is attached.

Press

Í ‘ Í

. All list elements remain, but the formula is detached and the lock

symbol disappears.

•

In the stat list editor, move the cursor onto an element of the list to which a formula is attached.

Press

, edit the element, and then press

. The element changes, the formula is

detached, and the lock symbol disappears. All other list elements remain.

•

Use

ClrList

. All elements of one or more specified lists are cleared, each formula is detached,

and each lock symbol disappears. All list names remain.

•

Use

ClrAllLists

(Chapter 18). All elements of all lists in memory are cleared, all formulas are

detached from all list names, and all lock symbols disappear. All list names remain.

Editing an Element of a Formula-Generated List

As described above, one way to detach a formula from a list name is to edit an element of the list

to which the formula is attached. The TI-84 Plus protects against inadvertently detaching the

formula from the list name by editing an element of the formula-generated list.

Because of the protection feature, you must press

before you can edit an element of a

formula-generated list.

The protection feature does not allow you to delete an element of a list to which a formula is

attached. To delete an element of a list to which a formula is attached, you must first detach the

formula in any of the ways described above.

Switching Stat List Editor Contexts

Stat List Editor Contexts

The stat list editor has four contexts.

•

View-elements context

•

View-names context