Texas Instruments TI-82 STATS - Page 109

Parametric Graphing 4-5
82EB1A~1.DOC TI-83 international English Bob Fedorisko Revised: 10/26/05 1:20 PM Printed: 10/27/05 1:58
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-82 STATS 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
X1T and
Y1T through X6T and Y6T.
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 (2p)
Tstep=.1308996... T value increment (pà24)
Xmin=L10 Smallest X value to be displayed
Xmax=10 Largest X value to be displayed
Xscl=1 Spacing between the X tick marks
Ymin=L10 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