Hp 48g Graphing Calculator Bedienungsanleitung PDF herunterladen (Seite 228)

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101

FINALS Contains the independent variable’s final value, ¿final-

You are trying to solve ?/(tFlNAL) = (some unknown).

Specifies the solution variable. (Defaults to Y.)

Contains the solution variable’s initial value (;^o = y{io))-

,s Contains the solution variable’s final value. This is what

you are trying to solve. You cannot enter a value in this

field.

Contains the acceptable level of absolute error. In a

physical model, select the tolerance to suit the accuracy of

the data, (Defaults to 0.0001.)

Contains the initial step size used to compute the solution.

The calculator uses the Runge-Kutta-Fehlberg method to

calculate i/final- This method computes its solution by

automatically stepping from point to point, maintaining

accuracy at each point.

F'!: Selects the stiff solver.

Lets you edit a field.

CHOUS Lets you select a variable.

I H I T+ Replaces the initial values with current final values. Use

this to compute the solution at another point using the

current solution as a starting point.

SOLVE Solve the differential equation.

Solving a Standard Initial-Value Problem

Standard initial-value problems are differential equations that don’t

require the STIFF solver. To determine how stiff a differential

equation is, try graphing it before solving it. Very slow graphing may

indicate that the equation is stiff and the stiff solver should be used.

1. Enter an equation or press C - 0 0 S to select an equation.

2. Specify the independent variable.

3. Enter the initial value for the independent variable.

4. Enter the final value for the independent variable.

5. Specify the solution variable.

19-2 Differential Equations

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