Sharp EL-9900 User Manual

1. Grasp the idea of sequential equations.

2. Use the graph tracing function to obtain approximate values.

1. First, let us set the calculator

to the appropriate graphing

coordinate mode. Press
@ ; to enter the
SETUP menu, press 

E

to select E COORD, then

press 

4 to select 4 Seq, and press C.

2. We will use the “Time”

sequential graph type within

the FORMAT menu. Press
@ f, press G
to select G TYPE, and 

2

to select 2 TIME.

3. Then press 

Y.

The Graph Equation Entry window will open.

4. Enter a new equation set

×

for

u(n)=. Press 

@ u

(

7) to enter  u and

press 

X for n. Press

E when done entering.

Press 

C to clear the previous entry.

Using a capitalized “U” or “N” here will result in an error upon

pressing the 

G key.

5. On the second entry row

(

u(nMin) =), enter 2000,

then press 

E.

The figure is automatically

enclosed by braces.

6. The v and the w entry sets will not be necessary in this case,

so press 

C to clear, then press E to move one row

down. Repeat until the four unnecessary entry rows are

cleared.