SLOPE FIELD - Casio 9800

Introduction
This program plots the slope field for the differential equation in the form ${\hbox{dy}\over \hbox{dx}}=\hbox{f(x,y)}$ .

If you have not used one of the programs posted on this website before, you should read through the information in the Intro to Programming section first.

The Program

'SLOPEFIELD' {' is in ALPHA} {This is the name of the program}

Cls {Cls is in SHIFT}

7 (Xmax-Xmin) 83 H {Xmin, Xmax are in VAR under RNG} { is on the , button}

7 (Ymax-Ymin) 55 K {Ymin, Ymax are in VAR under RNG}

1 (0.4H)^2 E { is the times sign}

1 (0.4K)^2 F

Xmin + 0.5H X

Ymin + 0.5K Z

12L

Lbl 1 {Lbl is in PRGM under JMP}

8J

ZY

Lbl 2

Y1T {Y1 is in VAR under GPH, then followed by a 1}

1 $\sqrt{}$ (E+F T^2) G { $\s\ qrt{}$ is square root}

T G S

Plot X-G, Y-S {Plot is in SHIFT}

Plot X+G, Y+S

Line {Line is in SHIFT}

Y+KY

Dsz J {Dsz is in PRGM under JMP}

Goto 2 {Goto is in PRGM under JMP}

X+HX

Dsz L

Goto 1

Running the Program

You will need to enter a function f(x,y) into Y1 and adjust the RANGE accordingly before running the program. To view the field after it is plotted use the GT button.

'SLOPEFIELD'	{' is in ALPHA} {This is the name of the program}
Cls	{Cls is in SHIFT}
7 (Xmax-Xmin) 83 H	{Xmin, Xmax are in VAR under RNG} { is on the , button}
7 (Ymax-Ymin) 55 K	{Ymin, Ymax are in VAR under RNG}
1 (0.4H)^2 E	{ is the times sign}
1 (0.4K)^2 F
Xmin + 0.5H X
Ymin + 0.5K Z
12L
Lbl 1	{Lbl is in PRGM under JMP}
8J
ZY
Lbl 2
Y1T	{Y1 is in VAR under GPH, then followed by a 1}
1 $\sqrt{}$ (E+F T^2) G	{ $\s\ qrt{}$ is square root}
T G S
Plot X-G, Y-S	{Plot is in SHIFT}
Plot X+G, Y+S
Line	{Line is in SHIFT}
Y+KY
Dsz J	{Dsz is in PRGM under JMP}
Goto 2	{Goto is in PRGM under JMP}
X+HX
Dsz L
Goto 1