Using The Diff Eq Mode; Execution - Casio Differential Equation Software Manual

1. Using the DIFF EQ Mode

You can solve differential equations numerically and graph the solutions. The general
procedure for solving a differential equation is described below.
Set Up
1. From the Main Menu, enter the DIFF EQ Mode.

Execution

2. Select the differential equation type.
• 1(1st) ........ Four types of first order differential equations
• 2(2nd) ...... Second order linear differential equations
• 3(N-th) ...... Differential equations of the first order through ninth order
• 4(SYS) ..... System of the first order differential equations
• 5(RCL) ..... Displays a screen for recalling a previous differential equation.
• With 1(1st), you need to make further selections of differential equation type. See
"Differential equations of the first order" for more information.
• With 3(N-th), you also need to specify the order of the differential equation, from 1
to 9.
• With 4(SYS), you also need to specify the number of unknowns, from 1 to 9.
3. Enter the differential equation.
4. Specify the initial values.
5. Press 5(SET) and select b(Param) to display the Parameter screen. Specify the
calculation range. Make the parameter settings you want.
h ...................
•
• Step ............. Number of steps for graphing*
• SF ................ The number of slope field columns displayed on the screen (0 – 100).
* 1 When graphed for the first time, a function is
always graphed with every step. When the
function is graphed again, however, it is
1-1
Using the DIFF EQ Mode
Step size for the classical Runge-Kutta method (fourth order)
The slope fields can be displayed only for differential equations of the
first order.
1
and storing data in LIST.
graphed according to a value of Step. For
example, when Step is set to 2, the function is
graphed with every two steps.