95
GRAPHING FUNCTIONS
6. Sequence Graphing
• The calculator is equipped with a sequence graph mode that can display regulated
sequences (arithmetic and geometric) which can be expressed using function
equations as graphs.
• The sequence graph mode can register or simultaneously draw three graph
equations u(
n
), v(
n
) and w(
n
).
• Variables u, v, and w for use in graphs are entered as Ï
(secondary
function of 7), Ï
,
and Ï . Variables are input in lower-case.
•
in the sequence graph mode is for the input of
n
.
<Example>
There is the following arithmetical progression as a sequence.
3, 6, 9, 12, 15, 18.…
Since the general term u(
n
) of this sequence can be expressed as “u(
n
–1) + 3”, we will
draw a graph with changes of
n
up to 10.
1. Set sequence graph mode (select [4 Seq] in the SET
UP menu).
Press Ï
E 4
.
The screen shown on the right will appear.
2. Input equation.
• Since the cursor pointer is positioned at u(
n
), the graph
equation is entered as is.
Press
Ï ( - 1 ) + 3 ®.
• The cursor will move one line below to “u(
n
Min)”.
• u(
n
Min) is the value of u(
n
) when the value of n is Min (minimum). In this case, it is 3.
• The screen shown to the right appears when pressing 3 ® and entry is com-
plete (in this example, input of equations v(
n
) and w(
n
) is not necessary).
EL-9650-(04)En (079-134) 8/7/00, 9:08 PM95
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