Sequence Graphing 351
•Draws a y=x reference line.
• Plots the selected sequence definitions as functions, with
u(nN1) as the independent
variable. This effectively converts a recursive sequence into a nonrecursive form for
graphing.
For example, consider the sequence u1(n) = and an initial value of
ui1=1.
The TI-89 Titanium draws the
y=x reference line and then plots y = .
Drawing the Web
After the sequence is plotted, the web may be displayed manually or automatically,
depending on how you set
Build Web on the AXES dialog box.
The web:
1. Starts on the x axis at the initial value ui (when
plotstrt = 1).
2. Moves vertically (either up or down) to the sequence.
If Build Web = The web is:
TRACE
Not drawn until you press …. The web is then drawn
step-by-step as you move the trace cursor (you must
have an initial value before using Trace).
Note
: With WEB axes, you cannot trace along the
sequence itself as you do in other graphing modes.
AUTO
Drawn automatically. You can then press
… to trace the
web and display its coordinates.
5 u1 n 1–()–
y 5 x–=
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