Index: A-M

abs(
abs( returns the absolute value of a real number, expression, list, or matrix. To find abs(, press

, and then

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Alpha Characters
The alpha characters are from A to Z and theta.

Discussed In:

Tutorial 1

Alpha-Lock
Changes the cursor to characters and the following keystrokes will display one of the alpha characters (letters), depending on which button you press.

Ans
Ans returns the value of the last answer. When an expression is successfully evaluated, the calculator stores the answer to a storage area called Ans. Ans may be a real or complex number, a list, a matrix, or a string. The main reason for using Ans is to save memory. Accessing Ans is easier for the calculator than accessing a variable. Ans is used just like the user variables, but there is one exemption. You cannot store a variable into Ans by using "

," so you can't do something like: "3267Ans." What you have to do is just put "3267" by itself. If you leave 3267 by itself on one line, it's automatically stored into Ans. To find Ans, just press

and

[Ans].

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Special Tutorial

' (Apostrophe)
This can be used to ways. In Tutorial 24, we use as a character in text, the apostrophe. As you know apostrophes are used to show possession (Frank's) and to create contractions (don't). This command is supposed to be used as the minutes (M) in the DMS format. DMS entry notation is degrees/minutes/seconds entry notation. So if you wanted to say that the angle of something was 30 degrees, 11 minutes, you'd put 30°11'. To find the apostrophe (minutes), press

and

[ANGLE]. Scroll down to 2:'.

Discussed In:

Tutorial 24

augment(
augment( returns a list, which is listB concatenated (added) to the end of listA. Ex. augment({1,2,3},{4,5,6}) would give {1,2,3,4,5,6}. The term concatenate means to add, but not like adding two numbers together. It literally means to attach one thing to the end of another. To find this command, press

and

[LIST], and

. Scroll down to 9:augment(.

augment( returns a matrix, which is matrixB, appended to matrixA as new columns. Ex. augment([[1,2][3,4]],[[5,6][7,8]]) would give:
[[1 2 5 6]
[3 4 7 8]]
To find this command, press

and scroll down to 7:augment(.

Discussed In:

Tutorial 27 and Tutorial 28

AxesOff
AxesOff turns the graph axes off. You can find this command by pressing

and

[FORMAT]. Press

four times,

once, and then press

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AxesOn
AxesOff turns the graph axes off. You can find this command by pressing

and

[FORMAT]. Press

four times, and then press

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Circle
Circle( draws a circle with center at (x,y) and a radius. Circle(X,Y,radius) If you want to use circles with text or pixels you will have to set the window variables because circles use the coordinate plane. To find Circle(, press

and

[DRAW]. Scroll down to 9:Circle(.

Discussed In:

Tutorial 16

ClrDraw
ClrDraw clears all drawn elements from a graph or drawing. You can find it by pressing

[DRAW], and then

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ClrHome
ClrHome (clear home screen) clears the home screen during program execution. You can find it by pressing

and then

and you should be in the I/O section. Scroll down to 8:ClrHome.

Discussed In:

Tutorial 1

ClrList
ClrList sets the dimension of one or more listnames to 0. ClrList is different from DelVar in that it only sets the dimension of the list to 0. It does not delete the list like DelVar does. To find this command, press

and scroll down to 4:ClrList.

Discussed In:

Tutorial 27

Colon (:)
The colon (:) does two totally different things in a BASIC program. If it's placed as the first line in the program by itself, then it is used so that you can make any of your BASIC programs compatible with AShell, SOS, or TI-Explorer. If it is written in between two commands, it is used so that you can write two different commands on the same line. ex. Disp "YES":Output(3,4,"NO") The : (colon) can be found by pressing

followed by period (.).

Discussed In:

Tutorial 1 and Tutorial 4

Connected
The Connected plotting mode draws a line connecting each point calculated for the selected functions. If you have a math program and you want a line when the calculator draws a function, add Connected to the beginning of the program. Most likely, however, most people's calculators will be already set on Connected. To find Connected, press

four times, and

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Dec

Dec converts a real or complex number, expression, list, or matrix in fractional form to decimal form.

Dec can only be used when displaying the value on the homescreen using Disp.

Dec will NOT work with Output( or Text(. To find this command, press

and scroll down to 2:

Dec.

Discussed In:

Tutorial 29

Degree
The Degree mode interprets angle values in trigonometric functions as degrees and displays answers in degrees. You generally would not use this command in programs, unless you were making a program that actually deals with trigonometric functions. You can find Degree by pressing

twice,

once, and

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DelVar
Deletes from memory the contents of the variable DelVar variable. ex. DelVar [A] To access this command press the

button and then move your cursor down to G:DelVar. Press

and DelVar should appear in the program editor. Note: DelVar doesn't delete the variable, it just erases the information that it contains.

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dim(
Returns the dimension of listname or matrixname: dim(listname) or dim(matrixname). dim( can be accessed in two ways:

Press the button, then the button, and finally the button. Scroll down to 3:dim(.
Press the button and then the button. Scroll down to 3:dim(.

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Disp
Disp by itself just displays the home screen. If you follow Disp with a value or text, it displays the value or text. ex. Disp 475,"HELLO",A You can find Disp by pressing

and then

and you should be in the I/O section. Scroll down to 3:Disp.

Discussed In:

Tutorial 2

DispGraph
DispGraph displays the current graph. It works exactly like Disp, but instead displays all the selected functions in the Y= menu instead of displaying text or values. To find DispGraph, press

and

. Scroll down to 4:DispGraph.

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Dot
The Dot plotting mode plots only the calculated points of the selected functions; it does not connect the points with a line. To find Dot, press

four times,

, and

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DrawF
DrawF draws expression as a function in terms of X on the current graph. DrawF expression You can use this command instead of having to store an expression into a Y= variable and then having to display it. You can find DrawF by pressing

and

[DRAW]. Scroll down to 6:DrawF.

Discussed In:

Tutorial 18

DrawInv
DrawInv draws the inverse of expression by plotting X values on the y-axis and Y values on the x-axis. DrawInv expression This command is probably more helpful in making math programs than games. You can find DrawInv by pressing

and

[DRAW]. Scroll down to 8:DrawInv.

Discussed In:

Tutorial 18

Else

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End
The End command identifies the end of a group of commands. You must include an End instruction at the end of each of each If-Then group, If-Then-Else group, For(, While, or Repeat command. If you do not put the End command, your program could be stuck in an endless loop. You can find End by pressing the

and then scrolling down to 7:End.

Discussed In:

Tutorial 4, Tutorial 7, and Tutorial 10

Equal To (=)
A test command that checks to see if valueA=valueB (if valueA is equal to valueB). This command is used a lot with conditionals. You can find the equals command by pressing

, then

[TEST], and then

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! (Exclamation Mark)
This command can be used in two ways. In Tutorial 24, we use it as an exclamation mark in text. As you already know exclamation marks are used to show interjections among other things. However, in the mathematical sense, the "!" is used as factorial. Factorial multiplies the given number by all the whole numbers less than it, excluding 0. So 6! is 6*5*4*3*2*1, which equals 720. To use the exclamation mark in text, press

then

. Scroll down to 4:!.

Discussed In:

Tutorial 24

Fill(
Fill( replaces each element in listname with a specified value. The value can be imaginary or complex. To find this command, press

and

[LIST], and

. Scroll down to 4:Fill(.

Fill stores value to every element in matrixname. value cannot be imaginary or complex. To find this command, press

and scroll down to 4:Fill(.

Discussed In:

Tutorial 27 and Tutorial 28

Fix
Fix (fixed) decimal mode specifies the number of digits, 0-9, to display to the right of the decimal. Fix # If you set the Fix at 5 and want to display 1, it'll display 0.50000. The Fix mode only works on the home screen. All numbers displayed on the graph screen are "floated." You might use the Fix command when you have a program that works with dollars and cents. You can find Fix either of two ways. You can find it by pressing

, and pressing the

button until you get to the number you want to set the decimal places to. This will display Fix and the number you selected after it. You can also find Fix by getting it from the Catalog and then typing the number that you want to set the decimal places to.

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Float
Float (floating) decimal mode displays in the usual way that we display numbers with decimals, with no trailing decimals. The Float mode will display a number like this: 987.63 and not something like this: 987.63000. The Float mode displays up to 10 digits and the decimal. To find the Float command press the

key,

, and then

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FnOff
FnOff deselcts all Y= functions or specified Y= functions. FnOff [function#,function#,...,function n] You can either just put FnOff, which will deselect all of the Y= functions or you can specify a particular function to deselect. To use this command press

and then

. Scroll down to 4:On/Off and press

. Scroll down to 2:FnOff.

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FnOn
FnOff selcts all Y= functions or specified Y= functions. FnOff [function#,function#,...,function n] You can either just put FnOff, which will select all of the Y= functions or you can specify a particular function to select. To use this command press

and then

. Scroll down to 4:On/Off and press

twice.

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For(
For executes everything inside the designated number of times. For(variable,begin,end[,increment]) It stores the variable, starting with begin and after doing everything in between the For and End, it re-stores the variable as the next has value according to the increment. It does this all the way up to end. However, this construction is only for counting forwards. If you want to count backwards, you must do this: For(variable,end,begin[,negative increment]) End is the big number, and begin is the smaller number. You can access For( by pressing

and then scroll down to 4:For(.

Discussed In:

Tutorial 7

fPart(
fPart( returns the fractional part or parts of real or complex numbers, expressions, lists, and matrices. If the value is negative, the fractional part of the value is also negative. To find fPart(, press

and RIGH

. Scroll down to 4:fPart(.

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Frac

Frac displays a real or complex number, expression, list, or matrix as a fraction simplified to its simplest terms. If the answer cannot be simplified or the number has more than three decimal places, then the decimal form is displayed.

Frac can only be used when displaying the value on the homescreen using Disp.

Frac will NOT work with Output( or Text(. To find this command, press

and

Discussed In:

Tutorial 29

Full
The Full screen mode uses the entire screen to display a graph. Once again, most people's calculator are probably set to the Full mode. To find Full press

seven times, and

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Func
The Func (function) graphing mode plots functions, where y is a function of x. This the normal graphing mode and the way that we learnt how to graph in Algebra. The function mode has equations like: y=2x+3. If you have a math program in which you are program in the function graphing mode, you generally do not even have to add Func in the beginning of the program because most people's calculators are usually already set in this mode. However, just to be safe, you should add it. To find Func, press

three times, and

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getKey
getKey returns a number corresponding to the last key pressed. If no key has been pressed, getKey returns 0. However, if you use getKey in a loop, it'll wait until a key is pressed. All the keys, except for the

key, have their individual key code. Press the

key at any time during a program and you can stop the program. To find getKey, press

and

. Scroll down to 7:getKey.

Discussed In:

Tutorial 21, Tutorial 22, and Tutorial 23

Goto
Goto causes the program to branch to label when it is encountered. The label can be one or two characters (one of the alpha characters or 0 through 99) or a combination. You can access Goto by pressing

and then scroll down to 0:Goto.

Discussed In:

Tutorial 6

Greater Than (>)
A test command that checks to see if valueA>valueB (if valueA is greater than valueB). This command is used a lot with conditionals. You can find the greater than command by pressing

, then

[TEST], and then scrolling down to 3:>.

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Greater Than or Equal To ()
A test command that checks to see if valueA

valueB (if valueA is greater than or equal to valueB). This command is used a lot with conditionals. You can find the greater than or equal to command by pressing

, then

[TEST], and then scrolling down to 4:

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G-T
The G-T (graph-table) split-screen mode displays the graph screen on the left half of the screen and the table on the right half. You would usually use this mode when you want to have the graph and the table show up at the same time. With graph screen text, the maximum value for row is 45, and 46 for column. With pixels, the maximum value for row is 50 and the maximum value for column is 46. With Output(, the maximum value for row is 8. To find G-T, press

seven times,

twice, and

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Horiz
The Horiz (horizontal) split-screen mode displays the graph screen on the top half of the screen and displays the home screen on the bottom. You would use this mode if you had a graph on the top and you wanted to the user to also view some text that you have on the home screen. With graph screen text, the maximum value for row is 25, and the maximum value for column is 46. With pixels the maximum value for row is 30. With Output(, the maximum value for row is 4. To find Horiz, press

seven times,

, and

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Horizontal
Horizontal draws a horizontal line through the y coordinate that travels from the extreme left of the screen to the extreme right. Horizontal y Because Horizontal uses the coordinate plane, you will have to make sure to set your window variables. You can find Horizontal by pressing

and

[DRAW]. Scroll down to 3:Horizontal.

Discussed In:

Tutorial 15

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Input
Input can be used in two ways. Input with a variable displays a ? (question mark) prompt during execution of the program. When the user enters a value, the value is evaluated and stored to the variable, and the program resumes execution. The other way to use Input is to follow it with "text" and then the variable that the text should be stored into. When a program prompts for the input of a list you must surround your answer with {}. When it prompts you to input a value for a matrix you must surround the numbers with []. Finally, you must surround expressions to be entered into Y= with "". To access this command press

, and then

Discussed In:

Tutorial 5

int(
int( returns the largest integer less than or equal to a real or complex number, expression, list or matrix. For a given value, the result of int( is the same as if you used iPart( for positive numbers and negative integers. However, for negative non-integer numbers, the result is one integer less. To find int(, press

and

. Scroll down to 5:int(.

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iPart(
iPart returns the integer part or parts of real or complex numbers, expressions, lists, and matrices. To find iPart(, press

and

. Scroll down to 3:iPart(.

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L
Used to create new lists Llistname ex. {3,7,2}

LTEST A user-created list names can be no longer than five characters. To access this command press the

button, then the

button, and then the

button. Scroll down to B:L.

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Lbl
Label specifies the label to which the program can go to. The label can be one or two characters (one of the alpha characters or 0 through 99) or a combination. You can access Lbl by pressing

and then scroll down to 9:Lbl.

Discussed In:

Tutorial 6

Less Than (<)
A test command that checks to see if valueA<valueB (if valueA is less than valueB). This command is used a lot with conditionals. You can find the less than command by pressing

, then

[TEST], and then scrolling down to 5:<

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Less Than or Equal To ()
A test command that checks to see if valueA

valueB (if valueA is less than or equal to valueB). This command is used a lot with conditionals. You can find the less than or equal to command by pressing

, then

[TEST], and then scrolling down to 6:

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Line(
Line( draws a line segment between the coordinates (X1,Y1) and (X2,Y2). To draw a line: Line(X1,Y1,X2,Y2) To erase part of a line: Line(X1,Y1,X2,Y2,0) You use line when you want to draw a line segment or a diagonal line. If you want to draw a vertical or horizontal line that covers the entire screen, use the commands Horizontal and Vertical. Because Line( uses the coordinate plane, you will have to make sure to set your window variables. You can find Line( by pressing

and

[DRAW]. Scroll down to 2:Line(.

Discussed In:

Tutorial 15

Lists
A list is a type of variable in which you can store a series of numbers. Whenever you want to create or store a list you must put the series of numbers, separated by commas, inside {}. The TI-83/TI-83 Plus has six list names in memory: L₁, L₂, L₃, L₄, L₅, L₆. The list names L₁ through L₆ are on the keyboard above the numeric keys,

through

. To put one of the lists into a program, press

, and then the appropriate number key. You can also create a list by: {value, value, value...}

ListName. The user-created list can only have five characters. To find a specific entry in a list: ListName(ListEntryNumber) For example, L₆(3) will give you the third entry in L₆.

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Matrices
A matrix is a two-dimensional array filled with numbers. Your calculator has 10 matrix variables, [A] through [J]. The dimensions of a matrix is row x column. To store the above matrix into [A]: [[1,3,5][7,2,9][4,8,6]]

[A]. You can find the matrix variables by pressing the

button.

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