User Manual

Chapter 5: Differential Equation Graph Application 25
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1. Start up the eActivity application and input the following expression and
matrix.
y” + y’ = exp(x)
[[0,1,0][0,2,0]]
2. From the eActivity application menu, tap [Insert], [Strip(2)], and then
[DiffEqGraph].
• This inserts a Differential Equation Graph data strip, and displays the Differential Equation Graph window in
the lower half of the screen.
3. Drag the stylus across “
y” + y’ = exp(x)” on the eActivity application window
to select it.
4. Drag the selected expression to the Differential Equation Graph window.
• This registers
y” + y’ = exp(x) on the differential equation editor ([DiffEq]
tab). The Differential Equation Graph window contents do not change at
this time.
5. Drag the stylus across “[[0,1,0][0,2,0]]” on the eActivity application window to
select it.
6. Drag the selected matrix to the Differential Equation Graph window.
• This graphs the solution curves of
y” + y’ = exp(x) in accordance with the
initial condition defined by the matrix, and registers the initial condition in
the initial condition editor ([IC] tab).