Differential Equation Graphing 409
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.
If Fields = Do this:
SLPFLD
– 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
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.
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