The System concept models the algorithmic implementation of the rhs. of the ODE x' = f(x,t). The only requirement for this concept is that it should be callable with a specific parameter syntax (see below). A System is typically implemented as a function or a functor. Systems fulfilling this concept are required by all RungeKutta steppers as well as the BulirschStoer steppers. However, symplectic and implicit steppers work with other system concepts, see Symplectic System and Implicit System.
System
A type that is a model of System
State
A type representing the state x of the ODE
Deriv
A type representing the derivative x' of the ODE
Time
A type representing the time
sys
An object of type System
x
Object of type State
dxdt
Object of type Deriv
t
Object of type Time
Name 
Expression 
Type 
Semantics 

Calculate dx/dt := f(x,t) 


Calculates f(x,t), the result is stored into dxdt 