Texas Instruments TI-83 - Page 109

Parametric Graphing 4-5
8304PARA.DOC TI-83 international English Bob Fedorisko Revised: 02/19/01 12:17 PM Printed: 02/19/01 1:36
PM Page 5 of 8
To define or edit a parametric equation, follow the steps in
Chapter 3 for defining a function or editing a function. The
independent variable in a parametric equation is
T. In Par
graphing mode, you can enter the parametric variable T in
either of two ways.
•
Press
„
.
•
Press
ƒ
ã
Tä
.
Two components,
X and Y, define a single parametric
equation. You must define both of them.
The TI
-
83 graphs only the selected parametric equations.
In the
Y=
editor, a parametric equation is selected when the
= signs of both the X and Y components are highlighted.
You may select any or all of the equations
X
1T
and Y
1T
through X
6T
and Y
6T
.
To change the selection status, move the cursor onto the =
sign of either the
X or Y component and press
Í
. The
status of both the
X and Y components is changed.
To display the window variable values, press
p
.
These variables define the viewing window. The values
below are defaults for
Par graphing in Radian angle mode.
Tmin=0
Smallest T value to evaluate
Tmax=6.2831853
...
Largest T value to evaluate (2
p
)
Tstep=.1308996
...
T value increment (
pà
24)
Xmin=
L
10
Smallest X value to be displayed
Xmax=10
Largest X value to be displayed
Xscl=1
Spacing between the X tick marks
Ymin=
L
10
Smallest Y value to be displayed
Ymax=10
Largest Y value to be displayed
Yscl=1
Spacing between the Y tick marks
Note:
To ensure that sufficient points are plotted, you may want to
change the
T
window variables.
Defining and
Editing
Parametric
Equations
Selecting and
Deselecting
Parametric
Equations
Setting Window
Variables