Texas Instruments TI-83 PLUS - Manual (Page 173)

TI-83 Plus Polar Graphing 170
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.
qmin=0 Smallest q value to evaluate
qmax=6.2831853 ... Largest q value to evaluate (2 p )
qstep=.1308996 ... Increment between q values ( pà 24)
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 q
window variables.