6-4 Sequence Graphing
8306SEQN.DOC TI-83 international English Bob Fedorisko Revised: 02/19/01 12:22 PM Printed: 02/19/01 1:36
PM Page 4 of 16
After selecting
Seq
mode, press
o
to display the sequence
Y=
editor.
In this editor, you can display and enter sequences for
u(
n)
,
v(
n)
, and
w(
n)
. Also, you can edit the value for
nMin
, which
is the sequence window variable that defines the minimum
n
value to evaluate.
The sequence
Y=
editor displays the
nMin
value because of
its relevance to
u(
nMin)
,
v(
nMin)
, and
w(
nMin)
, which are the
initial values for the sequence equations
u(
n)
,
v(
n)
, and
w(
n)
, respectively.
nMin
in the
Y=
editor is the same as
nMin
in the window
editor. If you enter a new value for
nMin
in one editor, the
new value for
nMin
is updated in both editors.
Note: Use
u(
nMin)
,
v(
nMin)
, or
w(
nMin)
only with a recursive
sequence, which requires an initial value.
The icons to the left of
u(
n)
,
v(
n)
, and
w(
n)
represent the
graph style of each sequence (Chapter 3). The default in
Seq
mode is
í
(dot), which shows discrete values. Dot,
ç
(line), and
è
(thick) styles are available for sequence
graphing. Graph styles are ignored in
Web
format.
The TI
-
83 graphs only the selected sequence functions. In
the
Y=
editor, a sequence function is selected when the
=
signs of both
u(
n)=
and
u(
nMin)=
are highlighted.
To change the selection status of a sequence function,
move the cursor onto the
=
sign of the function name, and
then press
Í
. The status is changed for both the
sequence function
u(
n)
and its initial value
u(
nMin)
.
Displaying the
Sequence Y=
Editor
Selecting Graph
Styles
Selecting and
Deselecting
Sequence
Functions