Texas Instruments TI-84 PLUS - Graphing Calculator Manual Book page 101

Defining and Editing Parametric Equations
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 parametric graphing
mode, you can enter the parametric variable T in either of two ways.
Press „.
•
Press ƒ [
• ].
T
Two components, X and Y, define a single parametric equation. You must define both of them.
Selecting and Deselecting Parametric Equations
The TI-84 Plus graphs only the selected parametric equations. In the Y= editor, a parametric
equation is selected when the
select any or all of the equations
To change the selection status, move the cursor onto the
and press Í. The status of both the X and Y components is changed.
Setting Window Variables
To display the window variable values, press p. These variables define the viewing window.
The values below are defaults for parametric graphing in Radian angle mode.
Tmin=0
Tmax=6.2831853...
Tstep=.1308996...
Xmin=L10
Xmax=10
Xscl=1
Ymin=L10
Ymax=10
Yscl=1
To ensure that sufficient points are plotted, you may want to change the
Note:
Setting the Graph Format
To display the current graph format settings, press y .. Chapter 3 describes the format
settings in detail. The other graphing modes share these format settings; Seq graphing mode has
an additional axes format setting.
signs of both the X and Y components are highlighted. You may
=
and through
X1T Y1T
Smallest T value to evaluate
Largest T value to evaluate (2
T value increment ( pà 24)
Smallest X value to be displayed
Largest X value to be displayed
Spacing between the X tick marks
Smallest Y value to be displayed
Largest Y value to be displayed
Spacing between the Y tick marks
and .
X6T Y6T
sign of either the X or Y component
=
)
p
Chapter 4: Parametric Graphing
window variables.
T
94