Texas Instruments TI-83 PLUS - Manual (Page 146)

TI-83 Plus Function Graphing 143
ZInteger
ZInteger redefines the viewing window to the dimensions shown below.
To use ZInteger , move the cursor to the point that you want to be the
center of the new window, and then press Í ; ZInteger replots the
functions.
@ X=1 Xscl=10
@ Y=1 Yscl=10
ZoomStat
ZoomStat redefines the viewing window so that all statistical data points
are displayed. For regular and modified box plots, only Xmin and Xmax
are adjusted.
ZoomFit
ZoomFit replots the functions immediately. ZoomFit recalculates YMin and
YMax to include the minimum and maximum Y values of the selected
functions between the current XMin and XMax . XMin and XMax are not
changed.