Texas Instruments TITANIUM TI-89 - Manual (Page 328)

Basic Function Graphing 328
Zooming In and Out on a Point Zooming In and Out on a Point Zooming In and Out on a Point Zooming In and Out on a Point
• For a ZoomIn , the x variables are divided by xFact , and the y variables are
divided by yFact .
new xmin = xmin/xFact , etc.
• For a ZoomOut , the x variables are multiplied by xFact , and the y variables are
multiplied by yFact .
new xmin = xmin
ù
xFact , etc.
Changing Zoom Factors Changing Zoom Factors Changing Zoom Factors Changing Zoom Factors
The Zoom factors define the magnification and reduction used by ZoomIn and ZoomOut .
1. From the „
Zoom menu, select 2:ZoomIn
or 3:ZoomOut .
A cursor appears, and the screen
prompts for
New Center?
2. Move the cursor to the point where you
want to zoom in or out, and then press
¸.
The TI-89 Titanium adjusts the Window
variables by the
Zoom factors defined in
SetFactors .