Texas Instruments TI-89 사용자 설명서

Differential Equation Graphing

 424

 With SLPFLD or DIRFLD, you can select initial conditions interactively regardless 

of whether you enter initial conditions in the Y= Editor. With FLDOFF, you can select 
initial conditions interactively. However, if three or more equations are entered, you must 
enter a single value (not a list) as the initial condition for each equation in the Y= Editor. 
Otherwise, a Dimension error occurs when graphing.

Note about Tracing a Solution Curve

Note about Tracing a Solution Curve

Note about Tracing a Solution Curve

Note about Tracing a Solution Curve

When you enter initial conditions in the Y= Editor or let 

 graph solution curves 

automatically, you can use 

… to trace the curves. However, you cannot trace a curve 

drawn by selecting an initial condition interactively. These curves are drawn, not plotted.

FLDOFF

•

Press: 

@

2

 

Š

 

You are prompted to select the axes for which you want to 
enter initial conditions.

Your selections will be used as the axes for the graph.

•

You can accept the defaults or change them. Then press 

¸

.

•

Specify an initial condition as described for SLPFLD or 
DIRFLD.

t is a valid selection. It will let 
you specify a value for t0.