Texas Instruments TI-83 PLUS - Manual (Page 148)

TI-83 Plus Function Graphing 145
ZoomRcl
ZoomRcl graphs the selected functions in a user-defined viewing window.
The user-defined viewing window is determined by the values stored
with the
ZoomSto instruction. The window variables are updated with the
user-defined values, and the graph is plotted.
ZOOM FACTORS
The zoom factors, XFact and YFact , are positive numbers (not
necessarily integers) greater than or equal to 1. They define the
magnification or reduction factor used to
Zoom In or Zoom Out around a
point.
Checking XFact and YFact
To display the
ZOOM FACTORS
screen, where you can review the current
values for XFact and YFact , select 4:SetFactors from the
ZOOM MEMORY
menu. The values shown are the defaults.