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Contributors are credited in each tip. I would also like to list them here, and thank them again.

Andrew Andy Kenneth Arnold

Alex Astashyn Bez Bhuvanesh Bhatt

Billy Damien Cassou Andrew Cacovean

cj Jordan Clifford cybernesto

Martin Daveluy Stuart Dawson George Dorner

ES Fabrizio Larry Fasnacht

Glenn E. Fisher Lars Frederiksen Gp

John Gilbertson Mike Grass Frank Mori Hess

Titmité Hassan Rick Homard Sam Jordan

Paul King Eric Kobrin Kevin Kofler

Kosh DV Ray Kremer Cass Lewart

Daniel Lloyd Christopher Messick Olivier Miclo

Francesco Orabona Roberto Perez-Franco Mike Roberts

Rick A. Samuel Stearley TipDS

TM Rafael Velazquez Gary Wardall

Frank Westlake Hank Wu ZLX

Contributors

0 - 9

Default Chapter3
- Table of Contents3
Contributors9
Revision Record: 9.0 to 10.010
1 0 Miscellaneous Tips12
- [1.1] Discussion Group Etiquette12
- [1.3] Alphabetic List of Reserved Variable Names13
- [1.4] Importing and Exporting PC Data with the TI-89 / TI-92 Plus14
- [1.5] Creating Picture Variables on a PC18
- [1.6] Manual Error for Setmode() Codes for Angle Modes20
- [1.7] Undocumented Error Codes20
- [1.8] Make a Protective Plastic 'Skin' for Your Calculator21
- [1.9] Physical Characteristics of TI-89 and TI-92 Plus21
- [1.10] Patents for TI-89 and TI-9223
- [1.11] "Low Battery" Indication Voltages27
- [1.12] Processor Clock Speed and Battery Voltage27
- [1.13] Developer's Guide Describes Calculator Internal Operation28
- [1.14] Cleaning a Calculator after Spills and Other Accidents28
- [1.15] Permission to Copy TI Guidebooks30
- [1.16] Use Your TI-89/TI-92 Plus as an On-Screen Ruler and Protractor31
- [1.17] Quick Tips39
- [1.18] Myth and Legend from the TI Discussion Groups40
- [1.19] Kraftwerk's Pocket Calculator Song49
- [1.20] TI-92 Plus Internal Photographs51
- [1.21] TI-89 Internal Photographs56
- [1.22] TI Calc-Con '02 Trip Reports60
- Ray Kremer Interview on TI Student Features Page62
2 0 Computer Algebra System (CAS) Tips65
- [2.1] Force Complete Simplification with Repeated Evaluation65
- [2.2] Try Constraints or Solve() in Symbolic Equality Tests65
- [2.3] Use When() for Absolute Values in Integrals66
- [2.4] Use Exact Mode to Ensure Limit() Success67
- [2.5] Try Manual Simplification to Improve Symbolic Integration67
- [2.6] CAS Uses Common Convention for Integral of X^n67
- [2.7] Use When() in Integration in AMS 2.0368
- [2.8] Use Expand() with Respect to Variable for Faster Results68
- [2.9] Find more Symbolic Integrals, Faster, with Real Mode and Constraints68
- [2.10] CAS Square Root Simplification Limitations69
- [2.11] Force Getnum() and Getdenom() to Return Correct Results with Part()70
- [2.12] Testing Equivalence of Symbolic Expressions71
- [2.13] Try Comdenom() to Find Limits72
- [2.14] Define Functions that CAS Can Manipulate72
- [2.15] Use Change of Variable in Limits of When() Functions73
- [2.16] Find Partial Fractions with Expand()73
- [2.17] Use a 'Clean' or Empty Folder for CAS Operations74
- [2.18] Delay Evaluation to Simplify Expressions74
- [2.19] Restrict Function Arguments to Integers75
- [2.20] Factor() with Respect to List Elements76
- [2.21] Differentiation and Integration Fail with Part()76
- [2.22] Methods for some CAS Functions77
- [2.23] Try Comdenom() for Faster Partial Factoring79
- [2.24] Infinity^0 Evaluates to 180
- [2.25] Factor on Complex I to Show Polynomial Complex Coefficients82
- [2.26] Limit() Fails with Piecewise Functions82
3 0 Data Structure Tips83
- [3.1] Using Indirection and Setfold() with Matrix Elements83
- [3.2] Calculate Table Indices Instead of Searching83
- [3.3] Delete Matrix Rows and Columns84
- [3.4] Reverse List Elements84
- [3.5] Unexpected Newmat() Operation in Cylindrical and Spherical Vector Modes84
- [3.6] Convert True/False List to 0'S and 1'S85
- [3.7] Replacement for Fill Instruction in Functions86
- [3.8] Work-Around for Writing to Data Variable Elements86
- [3.9] Replace Matrix Rows and Columns87
- [3.10] Appending Is Faster than Augment() for Adding Elements to Lists; Seq() Is Even Faster88
- [3.11] Store Anything in a Matrix88
- [3.13] Find Matrix Minor and Adjoint89
- [3.14] Randomize List Elements91
- [3.15] Turn Pretty Print off to Display Commas in Lists, Matrices92
- [3.17] Conditional Tests on Lists100
- [3.18] Swap List Elements100
- [3.19] Test a List for Identical Elements101
- [3.20] Find Matrix Minimum and Maximum101
- [3.21] Convert Matrices to Single-Row or Single-Column Vectors102
- [3.22] Create Lists with Logarithmic Element Spacing103
- [3.23] Use Single Bits as Flags to Save Status Information103
- [3.24] Use Equations to Build Lists of Lists and Matrices109
- [3.25] Internal Error with Seq() and Boolean Operators in List Index Calculation110
- [3.26] Find Indices of Specific Elements in Lists and Matrices111
- [3.27] Fast Symbolic Determinants116
- [3.28] Fill a List or Matrix with a Constant117
- [3.29] Convert Data Variables to Matrices117
- [3.30] Singular Value Decomposition (SVD) of a Matrix118
- [3.31] Store New List Element at Index Greater than Dimension120
4 0 Graphing and Plotting Tips121
- [4.1] Plot "Vertical" Lines on Graph Screen121
- [4.2] Use Dispg to Force Update to „X and „ y122
- [4.3] Truth Plots122
- [4.4] Plot Data and Functions Simultaneously124
- [4.5] 3D Parametric Line and Surface Plots126
- [4.6] Graphing Piece-Wise Defined Functions with "|" Operator126
- [4.7] Graphing Piece-Wise Defined Function with a Unit Step Function127
- [4.8] Plot Functions that Return Lists127
- [4.9] Faster Plots of Slow Functions128
- [4.10] Faster Plots of Integral Functions129
- [4.11] 3D Data Plots135
- [4.12] Random Scatter Plots of 'Noisy' Functions136
- [4.13] Bode Plots138
- [4.14] Completely Clear Graph Screen142
- [4.15] Delete Statistics Plots from Programs142
5 0 Graphlink Cable and Software Tips143
- [5.1] Unarchive Variables to Fix Graphlink Transmission Errors143
- [5.2] Backing up and Restoring Individual Variables May be Safer that Get Backup143
- [5.3] Do Not Restore a HW1 Backup to a HW2 Calculator143
- [5.4] Try Var-Link to Fix Graphlink Transmission Errors144
- [5.6] Build Your Own Graphlink Cable (Hess's BCC Serial Link)144
- [5.7] Graphlink Switchbox Aids CBR/CBL Programming155
- [5.8] Opening Variables in Graphlink Changes some Characters155
- [5.9] Graphlink Software Sends Either TI-89 or TI-92 Plus Files157
- [5.10] Run Graphlink under Windows XP158
- [5.11] Improve Font Size of Printed Program Source Code158
6 0 Math Tips159
- [6.1] Simulate Poly Function of TI-85/86159
- [6.2] Use Rectangular Complex Mode for Faster Results159
- [6.3] Improving Floating-Point Solutions to Simultaneous Equations160
- [6.5] Round Numbers to Significant Digits163
- [6.6] Linear Regression through a Fixed Point164
- [6.7] Complex Derivatives165
- [6.8] Convert Trigonometric Expressions to Exponential Format166
- [6.9] Convert Floating-Point Numbers to Exact Fractions167
- [6.10] Exact Solutions to Cubic and Quartic Equations167
- [6.11] Rounding Floating Point Numbers172
- [6.12] Find Faster Numerical Solutions for Polynomials172
- [6.13] Find Coefficients of Determination for All Regression Equations175
- [6.14] Use Norm() to Find Root Mean Square (RMS) Statistic for Matrices177
- [6.15] Convert Equations between Rectangular and Polar Coordinates177
- [6.16] Transpose Operator and Dot Product Find Adjoint and Complex Scalar Product178
- [6.17] Use DD.mmssss Format to Convert Angles Faster179
- [6.18] Use Ipart() and Int() Effectively180
- [6.19] Sub-Divide Integration Range to Improve Accuracy180
- [6.20] Generating Random Numbers181
- [6.21] Evaluating Polynomials182
- [6.23] Step-By-Step Programs183
- [6.24] Fast Fibonacci Numbers184
- [6.25] Polar and Rectangular Coordinate Conversions184
- [6.26] Accurate Numerical Derivatives with Nderiv() and Ridder's Method185
- [6.27] Find Bernoulli Numbers and Polynomials197
- [6.28] Bilinear Interpolation202
- [6.29] Dirac's Delta (Impulse) and Heaviside (Step) Functions213
- [6.30] Spherical Coordinate Conventions214
- [6.31] Fast 2Nd-Order Interpolation with Quadreg215
- [6.32] Accurate Approximate Solutions to Quadratic Equations with Large Coefficients218
- Sine and Cosine Integrals219
- [6.34] Error Function for Real Arguments222
- [6.35] Cumulative Normal Distribution and Inverse224
- [6.36] Integration May Return 'Undef' for Identical Integration Limits228
- [6.37] Random Number Generator Algorithm229
- [6.38] Finance Flash Application Function Finds Days between Two Dates229
- [6.39] Convert Equations to a Parameterized Form229
- [6.40] Write Functions with Multiple Input Argument Types230
- [6.41] Integration Error in AMS 2.05231
- [6.42] Stddev() and Variance() Find Sample (Not Population) Statistics233
- [6.43] Dot Product (Scalar Product) for Complex Vectors235
- [6.44] Nest Min() in Max() to Limit an Argument236
- [6.45] Determine if a Point Is Inside a Triangle236
- [6.46] Solve() and Nsolve() Ignore Constraints with Local Variables237
- [6.47] Unsigned Infinity Displays as Undef239
- [6.49] Taylor() Polynomial Function Finds Tangent Line240
- [6.50] the Savage Benchmark241
- [6.51] Review of TI-89 / TI-92 Plus Calculus Tools246
- [6.52] Return Complex Results in Real Mode with 0I248
- [6.53] Implicit Derivatives249
- [6.54] Delete Variables after Using Numeric Solver250
- [6.55] Algorithms for Factor() and Isprime()251
- [6.56] Fourth-Order Splice Joins Two Functions252
- [6.57] Sum Binary "1" Digits in an Integer268
- [6.58] Extract Floating-Point Mantissa and Exponent269
- [6.59] Accelerate Series Convergence270
- [6.60] Faster, more Accurate Exponential Integrals272
- [6.61] Find more Accurate Polynomial Roots274
- [6.62] Try Asymptotic Expansion for Functions of Large Arguments285
- [6.63] Faster Numerical Matrix Inverses288
- [6.64] Calculate through Undef and Get Correct Results289
7 0 TI Basic Programming Tips290
- [7.1] Create Evaluated Y= Editor Equations in Programs290
- [7.2] Using the Built-In Function Documentation in CATALOG290
- [7.3] Using Language Localization291
- [7.4] Return Error Codes as Strings293
- [7.5] Considerations for Referencing External Programs294
- [7.6] Recursion Limits295
- [7.7] Use Return Instead of Stop in Programs for Better Flexibility, and to Avoid a Crash295
- [7.8] Return Program Results to Home Screen297
- [7.9] Passing Optional Parameters to Functions and Programs299
- [7.10] Calling Built-In Applications from Your Programs300
- [7.11] Run TI Basic Programs before Archiving for Better Execution Speed300
- [7.12] Access a Variable from any Folder with "_" (Underscore)301
- [7.13] Write to Program & Function Arguments302
- [7.14] Determine Calculator Model and ROM Version in Programs303
- [7.15] Avoid for305
- Avoid for ... Endfor Loops305
- [7.17] Returning more than One Result from a Function306
- [7.18] Simplest (?) Application Launcher307
- [7.19] Bypass Programs Locked with Ans(1) and 4→Errornum:passerr309
- [7.20] Running Programs Within a Program309
- [7.21] Use Undef as an Argument310
- [7.22] Local Documentation for Functions and Programs310
- [7.23] Passing User Function Names as Program/Function Arguments310
- [7.24] Use a Script for Self-Deleting Set-Up Programs312
- [7.25] Use Scripts to Test Program and Functions313
- [7.26] DIM() Functions Slow down with Lists and Matrices with Large Elements314
- [7.27] Getmode() Returns Strings in Capital Letters314
- [7.28] Use Long Strings with Setmode() in Custom Menus315
- [7.29] Table of Getconfg() List Elements317
- [7.30] Sign() Function Is Not Compatible with Other Programming Languages318
- [7.31] Return Shows Variables During Debugging318
- [7.32] Documenting Programs319
- [7.33] Local Functions Must be Declared as Local Variables322
- [7.34] Use Linefeed Char(10) for Separate Lines in Program Help323
- [7.35] Conditonal Test in if324
- [7.36] Input Arguments for 'Keyboard' Programs324
- Conditonal Test in if ...Endif Evaluates All 'And' Arguments324
- [7.37] Simulate SWITCH or CASE Statement with GOTO and Indirection325
- [7.38] Why Use TI Basic326
- [7.39] Quickly Delete Locked, Archived Variables328
- [7.40] Recall Expression Without Variable Value Substitution329
- [7.41] Indirection Bug with Local Variables330
- [7.42] Find Variable Names Used in Expressions331
- [7.43] Faster Function Calls with List and Matrix Arguments334
- [7.44] Local Subroutines Execute Faster than Global Subroutines341
- [7.45] Display Text in Multiple Fonts and Pretty-Print Expressions342
- [7.46] Custom Command Makes Menu Labels for Trapped Function Keys349
- [7.47] Global Variables Not Evaluated When Local Variable Has the same Name351
- [7.48] Create Functions in Programs351
- [7.49] Read and Write Text Variables352
- [7.50] Modify Loop Control Variables Within the Loop353
8 0 String Variable Tips355
- [8.1] Convert Integers to Strings Without Extra Characters355
- [8.2] String Substitutions355
- [8.3] Creating Strings that Include Quote Characters356
- [8.4] Count Occurrences of a Character in a String356
- [8.5] String() Uses the Current Number Display Format357
- [8.6] Convert Strings to Upper- and Lower-Case357
- [8.7] Replacement for MID() and Right() Functions Use Position Instead of Count358
- [8.8] Relational Operators Compare Strings359
9 0 User Interface Tips360
- [9.1] Use Icons in Toolbars360
- [9.2] User Interface Considerations361
- [9.3] Take Advantage of Ok System Variable in Dialog Boxes363
- [9.5] Default Values for Variables in Request363
- [9.6] Position Cursor with Char364
- [9.7] Creating 'Dynamic' Dialog Boxes365
- [9.8] Dialog Box Limitations368
- [9.9] Display All 14 Significant Digits369
- [9.10] Group Fraction Digits for Easier Reading369
- [9.11] Access All Custom Menus from any Custom Menu371
- [9.12] Use One Request (in a Dialog Box) for more than One Variable372
- [9.13] Disable ALPHA Default in TI-89 AMS 2.05 Dialog Boxes376
- [9.15] [2Nd] [ENTER] Quickly Selects, Copies Entries to Command Line379
- [9.16] Use "Save Copy As" to Display the Current Variable Name in Editors379
- [9.17] Speed up the Keyboard380
- [9.18] Use Multiple Commands on Entry Line with381
- [9.19] Use a more Efficient RPN Interface382
- [9.20] Use a Graphical Equation Editor (Equation Writer)383
- [9.21] Programs for Simple Equation Libraries384
- [9.22] Minimize TI-89 Alpha Entry Inefficiencies388
10 0 Units Conversion Tips390
- [10.1] Units Calculations Are Approximate in Auto Mode390
- [10.2] Convert Compound Units to Equivalent Units390
- [10.3] Remove Units from Numbers391
- [10.4] Add Units to Undefined Variables391
- [10.5] Use Tmpcnv() to Display Temperature Conversion Equations391
- [10.6] Add Units to Built-In Units Menu392
11 0 Solving Tips394
- [11.1] Try Nsolve() if Solve() and Csolve() Fail394
- [11.2] Zeros() Ignores Constraint for Complex Solutions394
- [11.3] Try Czeros() and Csolve() to Find Real Solutions394
- [11.4] Using Solve() with Multiple Equations and Solutions in Programs395
- [11.5] Using Bounds and Estimates with Nsolve()397
- [11.6] Use Solve() as Multiple-Equation Solver399
- [11.7] Saving Multiple Answers with Solve() in Program400
- [11.8] Try Solve() for Symbolic System Solutions401
- [11.9] Nsolve() May Return "Questionable Accuracy" Warning Even with Good Solutions401
- [11.10] Solve() May Return False Solutions for Trigonometric Expressions403
- [11.11] Exp ▶ List() Fails with Solve() in User Functions404
- [11.12] Nsolve() May Ignore Solution Constraints404
12 0 C Programming Tips407
- [12.1] Advantages of TIGCC over TI SDK407
- TI Basic Extension App Template408
Appendix A: Anti-Tips411
Appendix B: more Resources412
- B.1] Faqs412
- [B.2] TI Documentation440
- [B.3] Web Sites441
- B.4] Bibliography444
Appendix C: Glossary455
Appendix D: Command Quick Reference Guide472
Appendix E: Tip List Programs and Functions504

Display size (HxV)	100 x 160 mm
Memory type	639K FLASH ROM, 188K bytes RAM
Compatible operating systems	Operating System 2.09
Battery type	AAA

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