Chapter 5: Polar Graphing
99
To change the selection status, move the cursor onto the
=
sign, and then press
Í
.
Setting Window Variables
To display the window variable values, press
p
. These variables define the viewing window.
The values below are defaults for Pol graphing in Radian angle mode.
Note:
To ensure that sufficient points are plotted, you may want to change the
q
window variables.
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.
Displaying a Graph
When you press
s
, the TI-84 Plus plots the selected polar equations. It evaluates R for each
value of
q
(from
q
min
to
q
max
in intervals of
q
step
) and then plots each point. The window
variables define the viewing window.
As the graph is plotted, X, Y, R, and
q
are updated.
Smart Graph applies to polar graphs.
Window Variables and Y
.
VARS Menus
You can perform these actions from the home screen or a program.
•
Access functions by using the name of the equation as a variable. These function names are
available on the YVARS shortcut menu (
t a
).
q
min=0
Smallest
q
value to evaluate
q
max=6.2831853
...
Largest
q
value to evaluate (2
p
)
q
step=.1308996
...
Increment between
q
values (
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
