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 90 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 90 of 22

To display the graph and begin a trace, select 

 from the 

GRAPH

 menu.

The trace cursor appears as a small square with a flashing
diagonal line at each corner. Initially, the trace cursor
appears on the first selected function, at the 

 value

closest to the middle of the screen.

If 

 format is selected, the cursor coordinates are

displayed at the bottom of the screen.

To move the trace cursor...

Press these keys:

To the next larger or next smaller plotted point in a function

" or !

To any valid independent-variable value (

, 

, or 

) on the current equation

 b

From one function to another function at 

, in the order or reverse order of

the selected functions in the equation editor

# or $

From one member to another member of a family of curves (Chapter 5)

# or $

As you move the trace cursor along a function, the 

 value is calculated from the 

 value. That is,

. When you trace beyond the top or bottom of the graph screen, the coordinates

displayed on the screen continue to change as if the cursor were still on the screen.

 To view function coordinates to the left or right of the current graph screen,

press and hold ! or " while tracing. When you pan beyond the left or right side of the
screen during a trace, the TI

-86 automatically changes the values of 

 and 

.

In the example, the function

 is graphed.

When you enter the first
character of an independent
variable value, an 

 prompt

is displayed (or 

 or 

). The

value can be an expression.

If the function is undefined at
an 

 value, then the 

 value

is blank.