Texas Instruments TI-89 사용자 설명서
Differential Equation Graphing
423
Selecting an Initial Condition Interactively from the Graph Screen
Selecting an Initial Condition Interactively from the Graph Screen
Selecting an Initial Condition Interactively from the Graph Screen
Selecting an Initial Condition Interactively from the Graph Screen
When a differential equation is graphed (regardless of whether a solution curve is
displayed), you can select a point on the Graph screen and use it as an initial condition.
displayed), you can select a point on the Graph screen and use it as an initial condition.
If Fields =
Do this:
SLPFLD
– or –
DIRFLD
– or –
DIRFLD
Press:
@
2
Š
Specify an initial condition. Either:
•
Move the cursor to the applicable point and press
¸
.
– or –
•
For each of the two coordinates, type a value and press
¸
.
-
For SLPFLD (1st-order only), enter values for
t0
and
y(t0)
.
-
For DIRFLD (2nd-order or system of two 1st-order
equations only), enter values for both
equations only), enter values for both
y(t0)
initial
conditions, where
t0
is the value set in the Y= Editor
or Window Editor.
A circle marks the initial condition and the solution curve is
drawn.
drawn.