Drawing The Web - Texas Instruments TITANIUM TI-89 User Manual

• Draws a reference line.
y=x
• Plots the selected sequence definitions as functions, with
variable. This effectively converts a recursive sequence into a nonrecursive form for
graphing.
For example, consider the sequence u1(n) =
The TI-89 Titanium draws the

Drawing the Web

Drawing the Web Drawing the Web Drawing the Web
After the sequence is plotted, the web may be displayed manually or automatically,
depending on how you set
If Build Web = The web is:
TRACE
Not drawn until you press
step-by-step as you move the trace cursor (you must
have an initial value before using Trace).
Note
sequence itself as you do in other graphing modes.
AUTO
Drawn automatically. You can then press
web and display its coordinates.
The web:
1. Starts on the x axis at the initial value ui (when
2. Moves vertically (either up or down) to the sequence.
Sequence Graphing
reference line and then plots y =
y=x
on the AXES dialog box.
Build Web
: With WEB axes, you cannot trace along the
5 u1 n 1 – –
...
. The web is then drawn
...
to trace the
plotstrt = 1
as the independent
u(n N 1)
and an initial value of
y = 5 x –
).
.
ui1=1
.
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