5-4 Polar Graphing
8305POLR.DOC TI-83 international English Bob Fedorisko Revised: 02/19/01 12:19 PM Printed: 02/19/01 1:36
PM Page 4 of 6
To define or edit a polar equation, follow the steps in
Chapter 3 for defining a function or editing a function. The
independent variable in a polar equation is
q
. In
Pol
graphing mode, you can enter the polar variable
q
in either
of two ways.
•
Press
„
.
•
Press
ƒ
ãqä
.
The TI
-
83 graphs only the selected polar equations. In the
Y=
editor, a polar equation is selected when the
=
sign is
highlighted. You may select any or all of the equations.
To change the selection status, move the cursor onto the
=
sign, and then press
Í
.
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.
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
Note: To ensure that sufficient points are plotted, you may want to
change the
q
window variables.
Defining and
Editing Polar
Equations
Selecting and
Deselecting Polar
Equations
Setting Window
Variables
