Texas Instruments PLUS TI-89 - Manual (Page 138)

Chapter 6: Basic Function Graphing 121
06BASFUN.DOC TI-89/TI-92 Plus: Basic Function Graphing (English) Susan Gullord Revised: 02/23/01 4:09 PM Printed: 02/23/01 4:18 PM Page 121 of 22
The Zoom factors define the magnification and reduction used by
ZoomIn and ZoomOut .
1. From the „ Zoom menu, select C:SetFactors to display the ZOOM
FACTORS dialog box.
Zoom factors must be ‚ 1, but
they do not have to be integers.
The default setting is 4.
2. Use D and C to highlight the value you want to change. Then:
¦ Type the new value. The old value is cleared automatically
when you begin typing.
— or —
¦ Press A or B to remove the highlighting, and then edit the old
value.
3. Press ¸ (after typing in an input box, you must press ¸
twice) to save any changes and exit the dialog box.
After using various Zoom tools, you may want to return to a previous
viewing window or save the current one.
1. From the „ Zoom menu, select
B:Memory to display its
submenu.
2. Select the applicable item.
Select: To:
1:ZoomPrev Return to the viewing window displayed before
the previous zoom.
2:ZoomSto Save the current viewing window. (The current
Window variable values are stored to the system
variables
zxmin , zxmax , etc.)
3:ZoomRcl Recall the viewing window last stored with
ZoomSto.
You can restore the Window variables to their default values at any
time.
From the „ Zoom menu, select 6:ZoomStd.
Changing Zoom
Factors
Tip: To exit without saving
any changes, press
N .
Saving or Recalling
a Viewing Window
Note: You can store only
one set of Window variable
values at a time. Storing a
new set overwrites the old
set.
Restoring the
Standard Viewing
Window