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TI-83 Plus Sequence Graphing 194
Displaying the Graph Screen
In
Web
format, press
s
to display the graph screen. The TI-83 Plus:
•
Draws a
y=x
reference line in
AxesOn
format.
•
Plots the selected sequences with
u(
n
N
1)
as the independent
variable.
Note: A potential convergence point occurs whenever a sequence intersects
the y=x reference line. However, the sequence may or may not actually
converge at that point, depending on the sequence’s initial value.
Drawing the Web
To activate the trace cursor, press
r
. The screen displays the
sequence and the current
n
,
X
, and
Y
values (
X
represents
u(
n
N
1)
and
Y
represents
u(
n
)
). Press
~
repeatedly to draw the web step by step,
starting at
n
Min
. In
Web
format, the trace cursor follows this course.
1. It starts on the x-axis at the initial value
u(
n
Min)
(when
PlotStart=1
).
2. It moves vertically (up or down) to the sequence.
3. It moves horizontally to the
y=x
reference line.
4. It repeats this vertical and horizontal movement as you continue to
press
~
.