216
CHAPTER 9
• Additionally, this method can be used to plot the graph and find approximate values
if the initial value is unknown when finding the solution by the Newton method.
• The start point (BEGIN) and end point (END) are input in this method, instead of
START and STEP in the Newton method.
• When the solution is found, the cursor flashes at the intersection of the two graphs
and the solution is displayed on the bottom of the screen.
• If the message, “ No solution in window”, is displayed on the screen, it shows that no
solution was found in the specified range.
• If this occurs, press
¬
to return to the variable input screen and change the
BEGIN and END values.
• To enlarge a part of the graph after the solution has been found, you may use the
ZOOM
Box function. (See CHAPTER 4 “9. Zoom Function” on page 100.)
<Example>
Find the time when the ball reaches a point 3 m high after it has been thrown straight
up at an initial speed of 10 m/sec.
Applicable equation: H = 0.5 GT
2
+ VT + D
(H: Height, G: Acceleration due to gravity = -9.8 m/s
2
, T: Time, V: Initial speed, D: Initial
height)
1. Press
Ï
¬
¬
. Clears the previous equation.
2. Press
Ï
A
3
. Selects the graphic mode.
Input the equation.
3. Press
Å
H
Å
=
0.5
Å
G
Å
T
+
Å
V
Å
T
+
Å
D
®
.
4. Input values for the known variables and calculate T.
Press 3
®
—
9.8
®
≥ 10
®
0
®
≤ ≤
Ï
and
.
5. Set the range.
Press 0
®
2
®
Ï
.
6. As a result, T = 0.365436467 ( 0.37 sec.) is obtained.
EL-9650-(09)EN (211-220) 8/1/00, 9:14 AM216
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