Texas Instruments TI-89 사용자 설명서

Sequence Graphing

 369

Example: Oscillation

Example: Oscillation

Example: Oscillation

Example: Oscillation

This example shows how the initial value can affect a sequence.

1. On the Y= Editor (

8 #), use the same sequence defined in the divergence 

example: u1(n) = 3.2u1(nN1) N .8(u1(nN1))

2

. Set initial value ui1 = 0.5.

2. Set 

.

3. On the Window Editor (

8 $), set the Window variables.

5. On the Y= Editor, set 

 and 

.

7. Regraph the sequence.

The web plot shows how quickly the 
sequence diverges to large negative 
values.

nmin=1
nmax=100
plotstrt=1
plotstep=1

xmin=0
xmax=100
xscl=10

ymin=0
ymax=5
yscl=1

4. Graph the sequence (

8 %).

 Compare this graph with the 

divergence example. This is the same 
sequence with a different initial value. 

y=3.2x

N

.8x

2

u(n

N

1)

u(n

y=x

u(n)

n