Texas TI-86 用户手册

06TOOLS.DOC   TI-86, Chap 6, US English   Bob Fedorisko   Revised: 02/13/01 2:23 PM   Printed: 02/13/01 3:01 PM   Page 93 of 22

06TOOLS.DOC   TI-86, Chap 6, US English   Bob Fedorisko   Revised: 02/13/01 2:23 PM   Printed: 02/13/01 3:01 PM   Page 93 of 22

Using 

, you can zoom in on any rectangular area within the current graph screen.

�   Select 

 from the 

GRAPH

 

ZOOM

 menu. The

zoom cursor is displayed at center screen.

�   Move the cursor to any spot you want to define

as a corner of the zoom box; mark the corner
with a small  square.

6 (
&

" # ! $
b

�   Move the cursor away from the first corner,

creating an adjustable box whose diagonal
corners are the small square and the cursor.

�   When you have defined the box, replot all

selected functions in the new graph screen.

�   Clear the menus from the screen.

" # ! $

b

:

Zoom factors define the magnification or reduction factor by which 

, 

, 

, and

 zoom in or zoom out around a point. To display the zoom factors editor, select

 from the 

GRAPH

 

ZOOM

 menu (press 6 ( / / '). 

 and 

 must

be 

‚ 1. The default value for both factors is 

 in all graphing modes.

 magnifies the part of the graph surrounding the cursor location. 

 displays a greater

portion of the graph, centered on the cursor location. 

 and 

 determine the extent.

The steps below describe how to use 

. To use 

, select it instead of 

 in step 2.

Before you begin these
steps, enter a function in the
equation editor. In the
example, the function

 is graphed.

To cancel 

 without

redefining the graph screen,
press 

:

.

When you replot the graph,
the TI

-

86 updates the window

variable values.

To store to 

 or 

from the home screen or in
the program editor, you can
select it from the 

VARS ALL

screen or enter it using
ALPHA and alpha keys.