HP 38g Graphing Calculator User Manual
Page 98
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Sequence
Example,
continued
■ [VIEWS]
Select Auto
Scale {{OK}}
Explore the graph and the
values for N and Ul by
pressing
g
and
[^.
As you trace the graph with the cursor keys, the crosshairs
jump from N:1 to N:2 to N:3, and so on. The values for Ul
change by smaller and smaller amounts until they converge.
NUM
N
Ul
a
1.5
H
1.415557
5
l.HlHilS
$
I.HIHBIH
8
1.41421356237
Scroll down to see that the
values for U] remain the same
for N»6. Therefore, -Jl is
1.41421356237 to 12 digits of
accuracy.
Compare the Stairstep plot (which plots N and Ul (N)) to a
Cobweb plot (which plots Ul(N-l) and U1(N)). Use
autoscaling for the plot. The coordinate values and the
Numeric view are identical to the Stairstep plot.
■ {SETUP-PLOT} [3
Set SEQPLOT to
Cobweb.
m
{VIEWS}
Select Auto
Scale {{OK}}
3-34
Plotting and Exploring Functions