17
Advanced 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 the slope field for a differential equation at
a finite set of points.
2. Create a new program with the name SFIELD. 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:
ClrDraw 2ndF DRAW A 1 ENTER
.1⇒H . 1 STO ALPHA H ENTER
ipart Xmin⇒J MATH B 3 2ndF VARS B ENTER A 1
STO ALPHA J ENTER
ipart Ymin⇒K MATH B 3 2ndF VARS B ENTER A 4
STO ALPHA K ENTER
J⇒X ALPHA J STO X/θ/T/n ENTER
K⇒Y ALPHA K STO ALPHA Y ENTER
Label A PRGM B 0 1 ALPHA A ENTER
X+H⇒AX/θ/T/n + ALPHA H STO ALPHA A
ENTER
If X≠0 Goto B PRGM B 0 3 X/θ/T/n MATH F
2 0 PRGM B 0 2 ALPHA B
ENTER
.00001⇒X . 0 0 0 0 1 STO X/θ/T/n ENTER
Label B PRGM B 0 1 ALPHA B ENTER
(sin X÷X) ( sin X/θ/T/n ÷ X/θ/T/n ) ( ALPHA
(A–X) +Y⇒B A – X/θ/T/n
)
+ ALPHA Y STO
ALPHA B ENTER
A⇒C ALPHA A STO ALPHA C ENTER
B⇒D ALPHA B STO ALPHA D ENTER
X–H⇒AX/θ/T/n – ALPHA H STO ALPHA A
ENTER
(sin X÷X)
(
sin X/θ/T/n ÷ X/θ/T/n
)(
ALPHA
(A–X) +Y⇒B A – X/θ/T/n
)
+ ALPHA Y STO
ALPHA B ENTER
SLOPE FIELDS
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