[tutorials & resource material arranged by topic Class Table calc1

Program a TI83

Find the Characters & the PRGM Menu
Input Stuff, Do Stuff, Store Stuff, Display Stuff
Solve Linear Systems Program
Compute the Slope of a Line Program
"Solve" for e
Take a "Derivative," Complete a "Definite Integral"
Run a Program

Find the Characters & the PRGM Menu

    Sometimes it feels harder to find the keys than to program the calculator.
    The keys needed most often are the
      ALPHA, in green, which serves as a shift to get to the letters and the quote symbol and the
      PRGM, which is a menu and even when writing the program is used to get to the 3 program menus.
    In the picture below, notice how many keys are needed just to produce 1 line of the program.
    Again, in the picture below, notice how many times these keys are needed to produce the entire program.
    The menus have been organized so the most frequently used keys are at the top of the list.

Input Stuff, Do Stuff, Store Stuff, Display Stuff

    To the left, an entire program is displayed. The program computes the slope.
    In order to create a program
      1st: Press PRGM, to get to the program menu.
      2nd: Curser over to NEW, to edit a new program.
      3rd: Type in the name of the program. The APLHA shift is already set.
      4th: Press enter to store the name and begin writing the first line of the program.
      A program is designed to do stuff, but, often this requires the user to input information.
    The INPUT command has two forms. For example,
      produces a question mark on the calculator screen and sits there until the user inputs a number.
INPUT "prompt", A
      gives the user a prompt then, produces a question mark on the calculator screen and sits there until the user inputs a number.
    The Disp, display command, has two forms. For example,
Disp A
      prints the value of storage location A on the screen.
Disp "prompt"
      prints a text message on the screen.
  To store a program, Press QUIT, above MODE.

A Program which Permits One to "Solve" for e

    Input a values for b which you think makes the area under the curve equal to 1.   Click.   Repeat as needed until the area is 1.   b=    

    Students who have never studied series or compounding have little background for e, the base of the natural log. This program gives them an introduction without series, compounding, or calc.

    In order for the integration to work nicely, a base for the log function must be chosen. There is a number to serve as a base. The ideal base is the number that makes the area drawn at the left in red equal to 1. This program permits one to guess at that number, e. The number e is the base of the natural log, ln(x), loge(x).

    The calculator program shades the requested area under the curve and completes the computation seeking an area or result equaling 1. See the box at the left.

1st. Store 1/x in Y9 in the Y= menu.
You may turn off the equal sign if you wish so the function stays stored and not visible in your other graphs.
2nd. Store the following program in the calculator. Locations of key functions and constants are found below.
Disp "Y9 is 1/x"
-.5 STO> Xmin
5 STO> Xmax
-.5 STO> Ymin
5 STO> Ymax
1 STO> Xscl
DrawF Y9
Input "e?",D
fnInt(1/x,x, 1,D) STO> E
Disp E
3rd. Run the program.
4th. At the first pause the above image is shown without the shading.
5th. Press [Enter] to continue with the program.
6th. A prompt next requests the guessed solution. Enter the guess.
7th. The requested area is shaded and computed.
8th. Enter another quess or e as desired.
9th. When you are finished with the program use ClrDraw to clear your graphing screen.
  • ClrDraw, DrawF, Line, and Shade are found in the Draw menu.
  • Xmin, Xmax, Ymin, and Ymax are found in the Var, Window menu.
  • fnInt is found in the Calc menu above Trace.
  • Shade(lower,higher, leftX,rightX,patterns,patres) and its parameters.
  • fnInt(expression,variable, lower,upper,[tolerance]) and its parameters.
  • Line(x1,y1,x2,y2) and its parameters.

    Take this link to read about "Exponential/Power Functions," and "A Bit about e"

"Take a Derivative or Complete a Definite Integral"

:Disp "PUT FX IN    
:Lbl 1
:Disp "DERIV=2"
:Disp "INTEGR=3"
:Input D
:If D=3
:Goto 3
:Lbl 2
:Input "AT X=",C
:Disp H
:Goto 1
:Lbl 3
:Input "A",A
:Input "B",B
:Disp E
:Goto 1

    This program will compute a derivative where one does not exist. It is using the slope of a secant rather than a tangent.

    This calculator is not a CAS machine, a computer algebra system, it does not really integrate or take a derivative.

    The function must be entered in the Y= menu because it is not possible to store an expression elsewhere.

Run A Program

    To run a program:
Press PRGM, then the number of the program you wish.
This puts the program on the home screen just as any other command.
Press ENTER.
This executes the command to run the program.
    In addition to the compute the slope program listed above, another page provides the code for a Solve Linear Systems Program.

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