Texas Instruments TI-89 Manual Book page 162

Exploring a Graph
Tip: During a trace, you can
evaluate a sequence by
typing a value for n and
pressing ¸ .
Tip: You can use
QuickCenter at any time
during a trace, even if the
cursor is still on the screen.
As in function graphing, you can explore a graph by using the
following tools. Any displayed coordinates are shown in rectangular
or polar form as set in the graph format.
Tool For Sequence Graphs:
Free-Moving Works just as it does for function graphs.
Cursor
„
Works just as it does for function graphs.
Zoom
¦
Only
Window variables are affected.
¦
The
plotStrt
6:ZoomStd
their standard values).
...
Depending on whether you use
Trace
axes,
WEB
¦
With
along the sequence one
approximately ten plotted points at a time, press
2 B or 2 A.
When you begin a trace, the cursor is on the
first selected sequence at the term number
specified by
viewing window.
QuickCenter
move the cursor off the screen (top or bottom,
left or right), press ¸ to center the viewing
window on the cursor location.
¦
With
not the sequence. Refer to page 147.
‡
Only
Math 1:Value
¦
With
(represented by
value.
n
¦
With
and
x
( , , ) and
x xmin xmax xscl
and Window variables (
n plot
, ) are not affected unless you select
plotStep
(which sets all Window variables to
operates very differently.
Trace
or axes, you move the cursor
TIME CUSTOM
plotstep
, even if it is outside the
plotstrt
applies to all directions. If you
axes, the trace cursor follows the web,
WEB
is available for sequence graphs.
and axes, the
TIME WEB
) is displayed for a specified
yc
axes, the values that correspond to
CUSTOM
depend on the axes you choose.
y
Chapter 9: Sequence Graphing
( , , )
y ymin ymax yscl
, ,
nmin nmax
, , or
TIME CUSTOM
at a time. To move
value
u(n)
145