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 89 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 89 of 22

When you select 

 from the 

GRAPH

 menu, the graph

screen is displayed with the free-moving cursor at the
center of the screen.

The cursor appears as a plus sign with a flashing center
pixel. To move the cursor, press ", #, !, or $; it moves
in the direction of the cursor key you press.

♦ 

In 

 format, each cursor movement updates the variables 

 and 

. In 

format, each cursor movement updates 

, 

, 

, and 

.

♦ 

In 

 format, the 

 and 

 cursor coordinates are displayed at the bottom of the

graph screen as you move the cursor.

The coordinate values displayed as you move the cursor approximate actual mathematical
coordinates, accurate to within the width and height of the pixel. As the difference between

 and 

 and between 

 and 

 becomes smaller (for example, when you zoom

in on a graph), graphing is more accurate and coordinate values approximate the actual
mathematical coordinates more closely.

The free-moving cursor coordinates represent the cursor location on the graph screen.
Moving the free-moving cursor precisely from one plotted point to the next along a function
is very difficult. To move along a function easily, use the trace cursor (page 90).

In the example, the function

 is graphed.

The numeric display mode
settings do not affect
coordinate display.