Texas Instruments TI-89 Voyage 200, User Manual

Page: 364 / 1008

Sequence Graphing 364
To change any of these settings, use the same procedure that you use to change other
types of dialog boxes, such as the MODE dialog box.
Using Web Plots
Using Web Plots Using Web Plots
Using Web Plots
A web plot graphs
u(n)
vs.
u(n N 1)
, which lets you study the long-term behavior of a
recursive sequence. The examples in this section also show how the initial value can
affect a sequence’s behavior.
Valid Functions for Web Plots Valid Functions for Web Plots Valid Functions for Web Plots Valid Functions for Web Plots
A sequence must meet the following criteria; otherwise, it will not be graphed properly on
WEB axes. The sequence:
• Must be recursive with only one recursion level;
u(n
N
1)
but not
u(n
N
2)
.
• Cannot reference n directly.
• Cannot reference any other defined sequence except itself.
When You Display the Graph Screen
When You Display the Graph Screen When You Display the Graph Screen
When You Display the Graph Screen
After you select WEB axes and display the Graph screen, the TI-89 Titanium:
X Axis
and
Y Axis
Active only when Axes = CUSTOM, these let you select the
value or sequence to plot on the x and y axes.
Item Description