Operation Manual

Sequence Graphing 6-5
8206SEQ.DOC TI-82, Chapter 6, English Bob Fedorisko Revised: 02/09/01 12:49 PM Printed: 02/09/01
12:50 PM Page 5 of 6
Setting WINDOW FORMAT
Press
p ~
to display the current
WINDOW FORMAT
settings.
Sequence graphing has one unique format,
Time
or
Web
. The other formats
are shared with the other graphing modes.
PolarGC
is ignored in
Time
FORMAT
.
WINDOW FORMAT
Time Web
Sets type of sequence plot
RectGC PolarGC
Sets rectangular or polar cursor
CoordOn CoordOff
Sets cursor coordinate on or off
GridOff GridOn
Sets grid off or on
AxesOn AxesOff
Sets axes on or off
LabelOff LabelOn
Sets axes label off or on
Displaying a Graph
As a
Seq
graph is plotted, the TI
.
82 updates
X
,
Y
, and
n
. Smart Graph
applies to sequence graphs.
Time
plots the sequence as a function of
n
. It evaluates
U n
and
V n
for each
value of
n
(from
n Min
to
n Max
by
1
) and plots each point.
Web
calculates
U n
as a function of
U n -
1
and
V n
as a function of
V n -
1
. It
plots
U n -
1
and
V n -
1
(independent variables) on the horizontal axis and
U n
and
V n
(dependent variables) on the vertical axis. The line
Y=X
is plotted
automatically.
Evaluating U n and V n
From the
Y
.
VARS
menu, you can access the function names
U n
and
V n
to:
¦
Calculate the
n
th value in a sequence.
¦
Calculate a list of values in a sequence.
¦
Generate a sequence with
U n (
nstart
,
nstop
,
nstep
)
.
nstep
is optional (if
not specified,
nstep
=1). Note:
U n
and
V n
are invalid with
seq(
.