10
Basic Keyboard/PROGRAMMING USING THE SHARP EL-9900
Copyright © 2002, Sharp Electronics Corporation. Permission is granted to photocopy for educational use only.
1. Program the calculator to graph a random walk. A random walk can go in
any direction for a random distance. This program stops when the graph
tries to go outside the calculator display.
2. Create a new program with the name WALK. Enter the following program
and remember to press ENTER at the end of each line. If you make a
mistake, use the calculator’s editing features to correct the error.
3. Enter the following program using the Advanced Keyboard:
ClrDraw 2ndF DRAW A 1 ENTER
0⇒D 0 STO ALPHA D ENTER
.5⇒X . 5 STO X/θ/T/n ENTER
.5⇒Y . 5 STO ALPHA Y ENTER
Label A PRGM B 0 1 ALPHA A ENTER
.2(random–.5)⇒H . 2
(
MATH C 1 – . 5
)
STO
ALPHA H ENTER
.2(random–.5)⇒K . 2
(
MATH C 1 – . 5
)
STO
ALPHA K ENTER
Line(X,Y,X+H, 2ndF DRAW A 2 X/θ/T/n , ALPHA
Y+K) Y , X/θ/T/n + ALPHA H , ALPHA
Y + ALPHA K
)
ENTER
X+H⇒XX/θ/T/n + ALPHA H STO X/θ/T/n ENTER
Y+K⇒Y ALPHA Y + ALPHA K STO ALPHA
Y ENTER
If X<0 Goto B PRGM B 0 3 X/θ/T/n MATH F
5 0 PRGM B 0 2 ALPHA B ENTER
If X>1 Goto B PRGM B 0 3 X/θ/T/n MATH F 3 1
PRGM B 0 2 ALPHA B ENTER
If Y<0 Goto B PRGM B 0 3 ALPHA Y MATH F 5 0
PRGM B 0 2 ALPHA B ENTER
RANDOM WALKS
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