Operation Manual

TI-83 Plus Parametric Graphing 160
Selecting and Deselecting Parametric Equations
The TI-83 Plus 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.
Setting Window Variables
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.