Gives the value of the right side of a first order Ordinary Differential Equation Used in frunge (Numeric resolution using Runge-Kutta 4 metthod)
time, independent variable
values of the unknown function at t
numeric vector : the set of parameters defining the function
the unique expression composing the body of dfdt is intended as the right side of the first order
differential equation :
dy/dt = dfdt(t,y,param)
The function body has to be written by the user.
param must take the form c(param1,param2,param3). if the initial value (y0) is used as a parameter (for model fitting for instance), it must be the last in the list and not used in dfdt.
a single float numeric value : the derivative of the unknown function at time t.
When used as argument for frunge, the initial condition y0 may be used as a parameter subject to fitting by
nls, for instance. In this condition, y0 must appear as the last parameter in param and must not be used nor modified in
Any textbook in mathematics
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