Question about Texas Instruments TI-89 Calculator

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The following program can not quit normally

Lbl ad0
input "distance",a
input "time",b
Disp"speed=",a/b
Goto ad0
EndPrgm

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The program is in a loop always...
when is displayed "speed" the next line order to go the begging and ask again the distance...

you have to include an instruction to quit
Lbl ad0
Input "distance",a
Input "time",b
Disp"speed=",a/b
Dialog
Title "Again"
DropDown "Repeat?",{"Yes", "No"},a
EndDlog
if a=1
Goto ad0
DispHome
EndPrgm

Posted on Jul 11, 2008

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I receive the error "Missing


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A train increases its normal speed by 12.5 % and reaches its destination 20 minutes earlier. What is the actual time taken? My email id is mala.mani19@gmail.com


You have two variables on the question. That is the Speed of the Train and the actual Time taken.
So you shouold be have two equations to resolve the two variables.
Lets assume the speed to be x and the actual time in minutes to be y.
So the 1st equation,
If the train goes with the actual or the normal speed x the train reaches within the time y.
we know that speed = distance X Time
so X = Distance x Y or
Distance = X/Y ------- 1
Next the 2nd equation.
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Nov 22, 2010 | Office Equipment & Supplies

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I am trying to graph to evaluate each expression. how could i do it on the calculator(ti-83) a:(f+g)(0) b)(f-g)(-1) c)(fg)(1) (d)(f/g)(3()


Let us see if I understand what you want to do. You have two functions f and g. With f and g you create four functions,
  1. f+g, which you want to evaluate at 0
  2. f-g, which you want to evaluate at -1
  3. f*g, which you want to evaluate at 1
  4. and f/g, which you want to evaluate at 3
If that is not what you intend to do, then I am sorry to I that interpreted incorrectly and you will have to post a comment with more information.
If however I did understand what you want to do, then there is a simple way to achieve this
  1. In the [Y=] function editor, enter Y1 and Y2
  2. In your mind decide which one represents f(x) and which represents g(x), probably f(x)=Y1(x) and g(x)= Y2(x)
  3. Validate each one by pressing [ENTER]
  4. Do not worry about graphing the function.
  5. Press [2nd][QUIT] to return to main calculator screen
  6. Enter a value (for example 5) and store it in variable X; to do so you press 5 [STO->][X,T, theta,n] [ENTER]
  7. To calculate f(x)+g(x) or (f+g)(x) on the command line in main calculator screen
  • Press [VARS][=>][Y-VARS][1:Function][1:Y1][ENTER]. Main calculator screen echoes Y1
  • Press [+]. Screen shows Y1+
  • Press [VARS][=>][Y-VARS][1:Function][1:Y2][ENTER]. Main calculator screen echoes Y1+Y2
  • Press [ENTER] to obtain the value of f+g at X=5
As you can see, if you want a different operation f-g, f*g, or f`/g for a different value of X, you will have to repeat steps 6 and 7.

I am going to show you how to create a small program that will perform all the 4 operations in sequence, each time asking you for the value of X you want to use. If you are not interested, you can ignore what follows. I remain convinced that it will be helpful for other visitors.

Creating a simple program

Press [PRGM]
Use arrow to highlight [NEW]
Press [ENTER]
Screen displays
PROGRAM
Name= with alpha cursor blinking
Type in the name, for example FOPG ( meaning F operation G) or anything else. Do not use a keyword (reserved command of the TI84Plus) These are what you find in the [CATALOG].

ddae385.jpgac147eb.jpg

The top line on each screen capture is inserted by the program editor after you choose the name. The last line of first screen is the the same line as the second line on 2nd screen. It must not be entered. The colon : is supplied by the program editor. It is the beginning of an instruction.

There are only to commands that are repeated here: Disp and Prompt

Disp orders the program to display
  1. a message (what is between the quotation marks) or
  2. the result of a calculation: Y1+Y2, Y1-Y2, Y1*Y2, or Y1/Y2
Prompt X will display X=? and the blinking cursor. You are supposed to enter the desired value of X and press [ENTER].
The Disp and Prompt command are accessed through the command catalog by pressing [2nd][0] (CATALOG) then scrolling along the list of commands to find the one needed. Shortcuts are possible (see below)

How to key in the program steps within the program editor
: Disp "F+G"

Press [2nd][0] (CATALOG) [X^-1](D) [Scroll Down [till...] Disp
Press [ENTER]. Editor shows :Disp
Press [ALPHA] [+] ("). Editor shows :Disp "
Press [ALPHA][COS] (F). Editor shows :Disp "F
Press [+]. Editor shows :Disp "F+
Press [ALPHA][TAN] (G). Editor shows :Disp "F+G
Press [ALPHA][+] (") Editor shows :Disp "F+G"
Press [ENTER] to validate instruction
Calculator inserts a new line :

: Disp Y1+Y2
Press [2nd][0] (CATALOG) [X^-1](D) [Scroll Down [till...] Disp
Press [ENTER]. Editor shows :Disp
Press [VARS][=>][Y-VARS][1:Function][1:Y1][ENTER]. Editor shows :Disp Y1
Press [+] . Editor shows :Disp Y1+
Press [VARS][=>][Y-VARS][1:Function][1:Y2][ENTER]. Editor shows :Disp Y1+Y2
Press {ENTER] to validate instruction
Editor inserts a new line :


:Prompt X
Press [2nd][0] (CATALOG) [8](P) [Scroll Down [till...] Prompt
Press [ENTER]. Editor shows :Prompt
Press [X,T.theta,n] key. Editor shows :Prompt X
Press [ENTER] to validate instruction
Editor inserts a new line :

To save program
Once all instructions are entered, press [2nd][QUIT] to save program.

To run program


  1. Press [PRGM]
  2. Under the [EXEC] menu, the list of available programs appears.
  3. Type the number corresponding to the one you want to run ( FOPG) and press [ENTER].
  4. The main calculator screen displays prgmFOPG and blinking cursor.
  5. Press [ENTER] to make it run
  6. Enter a value of X and press [ENTER]
  7. Follow instructions.

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1 Answer

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Hello,
Press [PGRM] [|=>][NEW][1:Create New][ENTER]
At the prompt NAME=, Type the name of the program.
Use the catalog [2nd][CATALOG] to enter the commands Input, Lbl, nDeriv(, Disp, Pause, If, abs(, Stop, and Goto.
In the catalog, the entry mode is ALPHA

94e4275.jpgcaf0d60.jpg
  1. The fisrt two lines of the second screen are not to be entered. (It is an overlap). I had to scroll down to get to the bottom of the program editor screen.
  2. Before you can use it to solve for the zeros of a function, you must define it in the [Y=] editor.
  3. The symbol Y1 in the program listing can be entered by pressing [Vars][|=>Y-VARS][1:Function][1:Y1].
  4. When finished entering the program press [2nd][QUIT] to exit the editor.
To run it, press [PGRM]. Under the menu [EXEC] you see a list of the available programs. Select the one you want and press [ENTER]
During the run, the program finds an iterate and waits (Pause) for you to press [ENTER]. You must keep pressing [ENTER] after each iteration, until it returns Done.

Hope it helps.
Thank you for using FixYa.
Do not forget to rate the solution.

.

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Hello,
Here is the program taken from the manual for the calculator. Key it in and use.

7848626.jpg
6f5d0fa.jpg The program requires 94 bytes.
Hope it helps.

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With the "Goto" statement out of the program, you can also remove the "Lbl" statement as well.

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1 Answer

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Hit the program button and press right two times the enter to get a new program.
Name your program "PERCENT"
hit enter
hit program, right, enter, to paste "Input" onto your screen
In quotes, put "Number?", then a comma, then N (not in quotes)
Press enter to get to a new line.
Enter "100N-->N" (once again, not in quotes)
The arrow is found directly above the on button
Press ENter again, putting you on the third line.
Hit program, right, 3 to paste Disp on your screen.
Put N after, not in quotes

Your screen should look like this:

PROGRAM:PERCENT
:Input "NUMBER",N
:100N-->N
:Disp N

Press 2nd Mode to quit, then hit the program key and select program Percent to run (making sure you are in the "Exec" menu)
Hit enter to run your program: it should turn decimals or fractions to percents.
Don't feel that your intelligence is being insulted by me giving explicit instructions that may be below your level in programming: I did not know whether or not you were proficient.

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