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 ãTä.
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 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