Operation Manual

Chapter 5: Polar Graphing 103
Selecting and Deselecting Polar Equations
The TI-84 Plus C 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.
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.
Note: Detect Asymptotes option is available in Func mode only.
Displaying a Graph
When you press s, the TI-84 Plus C plots the selected polar equations. It evaluates R for each value
of q (from qmin to qmax in intervals of qstep) 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 (see Chapter 3) 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 (ta).
q
min=0
Smallest q value to evaluate
q
max=6.2831853...
Largest q value to evaluate (2p)
q
step=.1308996...
Increment between q values (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