Texas Instruments TI-83 PLUS - Manual (Page 109)

TI-83 Plus Function Graphing 106
2. Press q
6 to select 6:ZStandard . This is a
quick way to reset the window variables to the
standard values. It also graphs the functions;
you do not need to press
s .
Notice that the functions appear as an ellipse in
the standard viewing window.
3. To adjust the display so that each pixel
represents an equal width and height, press
q
5 to select 5:ZSquare . The functions are
replotted and now appear as a circle on the
display.
4. To see the ZSquare window variables, press
p and notice the new values for Xmin ,
Xmax , Ymin , and Ymax .