Defining the model

All differential equation models begin with a differential equation. If the problem is an intial value problem, an initial condition is also needed. Replace the question marks ( %? ) in the following input regions to define the relevant ODE model.

> MODEL := diff( y(t) , t ) = -2*y(t) ; # define the differential equation model

> IC := y(0) = -1 ; # specify an initial condition

> VAR := { y(t) }; # specify the variables in the model

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