Sharp el-9950

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Chapter 4: Graphing Features
7. Graphing Sequences
TheSetupsettingCOORDSeqenablesyoutoinputanddrawuptothreeexplicitor
recursive sequence equations u(n), v(n), w(n) .
Variablesu,vandwareenteredas
@ 7
,
@ 8
, and
@ 9
respectively. Use
X
to enter the natural number n.
Asequenceisanordered,numberedseriesofnumbers.Sequence
equations may be recursive or explicit. In an explicit equation, only
the variable n is used to calculate the nth sequence element, and
in a recursive equation only the value of
u
(n-1)
.
Using the sequence {1, 2, 4, 8, 16, 32, …} as an example, this
means:
u(n) = 2
n
(explicit representation)
u(n) = 2 u
(n-1)
(recursive representation)
In
@
f G
(TYPE)
five different settings are pos-
sible for drawing sequences. The
default setting is Time.
Iftheexpectedgraphisnotdrawnortheerrormessage“Invalid”
appears this may be caused by an incorrect setting for TYPE.
For base n (Time)
ThevaluesofnareplottedalongtheX-axisandthevaluesofthe
sequenceelementsalongtheY-axis.
uv setting
u(n)
isplottedalongtheX-axis,and
v(n)
alongtheY-axis.Theuw
and vw settings are analogous.
Web setting
Here,theX-axisrepresents
u
(n-1)
andtheY-axis
u(n)
. When using
this setting, a recursive sequence representation is mandatory.