Texas Instruments TI-83 Using a Program to Guess the Coefficients

Applications 17-9

8317APPS.DOC TI-83 international English Bob Fedorisko Revised: 02/19/01 1:00 PM Printed: 02/19/01 1:39 PM

Page 9 of 20

This program graphs the function A sin(BX) with random

integer coefficients between 1 and 10. Try to guess the

coefficients and graph your guess as C sin(DX). The

program continues until your guess is correct.

PROGRAM:GUESS

:PlotsOff :Func

:FnOff :Radian

:ClrHome

:"Asin(BX)"!Y1

:"Csin(DX)"!Y2

Define equations.

:GraphStyle(1,1)

:GraphStyle(2,5)

Set line and path

raph

styles.

:FnOff 2

:randInt(1,10)!A

:randInt(1,10)!B

:0!C:0!D

Initialize coefficients.

:L2p!Xmin

:2p!Xmax

:pà2!Xscl

:L10!Ymin

:10!Ymax

:1!Yscl

Set viewing window.

:DispGraph

:Pause

Display graph.

:FnOn 2

:Lbl Z

:Prompt C,D Prompt for guess.

:DispGraph

:Pause

Display graph.

:If C=A

:Text(1,1,"C IS OK")

:If CƒA

:Text(1,1,"C IS WRONG")

:If D=B

:Text(1,50,"D IS OK")

:If DƒB

:Text(1,50,"D IS WRONG")

Display results.

:DispGraph

:Pause

Display graph.

:If C=A and D=B

:Stop

:Goto Z

Quit if

uesses are

correct.

Using a Program to Guess the Coefficients

Setting Up the

Program