TI 83/84 PlusGraphing Calculator

ProgrammingProject

Created by L. Tucker

Get out your highlighters,

please

Step 1: Hand Drawing on Graph Paper

Creativity Score:

8

Drawing Tip: KISS(Keep It Simple, Silly)

Example 1: looks nice but was a bit too complicated to program.

Drawing Tip: KISS (Keep It Simple, Silly)

Example 2: After struggling to meet the deadline, sheChanged her drawing to use simple lines & parabolas.

Creativity Score:

3

Step 2: Writing Equations for All Lines in Drawing

Step 3: Programming Calculator

Step 4: Printing Picture

Drawing by Michelle Tucker May 2007

Example:

Initial Steps:

PRGM, NEW, ENTER (type in name), ENTERPrepare Calculator:2ND, DRAW, 1:CLRDRAW, ENTER (clears display)2ND , FORMAT, ↓ ↓ ↓ → , ENTER (turns axes off)2ND, STATPLOT, PLOTSOFF, ENTER (turns plots off)VARS, Y-VARS, 4:ON/OFF, 2:FnOFFZOOM, 5:ZSQUARE (will ensure that circles appear round instead of oval)

TI 83/84 Plus Programming Steps & Notes

#1

Begin Programming:

To program a horizontal line at y = -3 from x = -5 to x = 2 (line segment):

:DrawF 0x-3/(x≥-5 and x≤2)

2nd, Draw, 6 2nd, Test, 42nd, Test, →, logic, 1 2nd, Test, 6÷

For Quadratic Lines: enter x2 instead

Change slope for slanted lines

#2

For slanted lines, change the slope y = mx + b

To Program a Vertical Line Segment:

x1 y1 x2 y2

2ND, DRAW, 2:LINE :Line (-3, -1, -3, 5)

x1 y1

(-3, 5)

x1 y1

(-3, -1)

#3

SHADE: Example – shade between -3x + 9 and y = -3 from x = 1 to x = 9:

Shade pattern

Shade from x=1 to x=9

#4

Draw a Circle: 2ND, DRAW, 9: CIRCLE Example: :Circle (-6, 5, 2)

Location of center x, y

radius

#5

Add Text:

2ND, DRAW, 0:TEXT Example: :Text (34, 5, “HELLO”)

Location of first letter row, column

HELLO

0, 0

42, 94

0, 94

42, 0

This is a trial and error process toget the correct text placement.No not use anynegative signs!

#6

Other Tips and Tricks?

Insert a programming line: 2ND, INS, ENTER

Scroll Down: 2ND, ALPHA, ↓ ↓ ↓. . . . , ALPHA

To Number a Line within Your Program: Ex: :5:Vertical -2

Programming Errors:• Error: usually means you are trying to divide by zero. Cause: left out

DrawF• Lines are not being drawn: Cause: domain restriction is set wrong• If you do not see your line, you either goofed on your restrictions or y-

intercept.• If you get an error, choose “2 GOTO”. This will take you to the line with the

error in it.

You may want to turn the “axes on” during programming so you can see your restrictions.

#7

Tips for Students:

• Do not remove the batteries – this will erase your program

• Don’t do 2nd MEM, 7, 1, 2 (test this out to see if it erases the program)

• Write all equations & steps in case your program is deleted.

• To protect your program from accidentally being erased:

– 2nd, Mem, 5:Archive, PRGM, choose your program– To unarchive your program for editing, 2nd, Mem,

6:Unarchive, PRGM, choose your program

Reasons Why You Can’t See Your Line:

:DrawF 1.5x/(x≥8 and x≤10)

#8

Reasons Why You Can’t See Your Line:

:DrawF 1.5x/(x≥5 and x≤2)

No calculators in hands until:– Students draw picture on grid. Teacher approves

sketch of drawing on grid paper– Students fill out chart with equations. Teacher has

approved all equations filled out on chart

Turn In: • Print out of picture and lines of programming

(use TI Connect software)• Hand-drawn picture on graph paper• Hand-written chart of equations as they appear

in the program.

Connecting Parabola Examples:

Shading Parabola Example:

Tip: turning the axes back ontemporarily will help you

determine the domain restrictions

on your parabolas.

Shading Tip:If your functions

graph properly but the shading is missing, you entered your

functions wrong (the lower function

goes in first, following by the upper function).

.5(x+6)+4 .5(x-6)+4

-.5(x+6)-4 -.5(x-6)-4

Shading Examples:

…1,1)

…1,2)

…1,3)

…1,6)

1: shade vertically2: shade horizontally3: shade diagonally (neg. slopes)4: shade diagonally (pos. slopes)

…1,6)

Pixel width from shaded line to line

…2,1)

…2,2)

…2,3)

…3,1)

…3,2)

…3,3)

Tweaking Your Program

Incomplete but cute!

Includes two illegal commands

TIP:

When deciding on apicture to draw,

remember the KISSprincipal:

Keep It Simple, Silly!

(you will be a muchhappier computer

programmer)

Another Tip:

Programming will beeasier if your picture

fills up the entirescreen.

Creativity Score:

10

Creativity Score:

10