Texas Instruments TI-82 STATS Manual Book page 109

Defining and
Editing
Parametric
Equations
Selecting and
Deselecting
Parametric
Equations
Setting Window
Variables
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
graphing mode, you can enter the parametric variable
of two ways.
Press „.
Press ƒ ã
T
Two components,
You must define both of them.
The TI-82 STATS graphs only the selected parametric
equations. In the
Y=
when the signs of both the
=
highlighted. You may select any or all of the equations
through and
Y X
1T 6T
To change the selection status, move the cursor onto the = sign
of either the or
X Y
both the and components is changed.
X Y
To display the window variable values, press p. These
variables define the viewing window. The values below are
defaults for graphing in
Par
Tmin=0
Tmax=6.2831853...
Tstep=.1308996...
Xmin=L10
Xmax=10
Xscl=1
Ymin=L10
Ymax=10
Yscl=1
Note: To ensure that sufficient points are plotted, you may want to
T
change the window variables.
ä.
and , define a single parametric equation.
X Y
editor, a parametric equation is selected
and
X Y
.
Y
6T
component and press Í. The status of
angle mode.
Radian
Smallest value to evaluate
T
Largest value to evaluate (2p)
T
value increment (pà24)
T
Smallest value to be displayed
X
Largest value to be displayed
X
Spacing between the
Smallest value to be displayed
Y
Largest value to be displayed
Y
Spacing between the
Parametric Graphing 4-5
. In
T Par
T
components are
tick marks
X
tick marks
Y
in either
and
X
1T