The derivative function of the von Bertalanffy growth model, an example of a one-dimensional autonomous ODE system.
vonBertalanffy(t, y, parameters)Returns a list containing the values of the two
derivatives at
(t, x, y).
The value of t, the independent
variable, to evaluate the derivative at. Should be a
numeric vector of
length one.
The value of y, the dependent
variable, to evaluate the derivative at. Should be a
numeric vector of
length one.
The values of the parameters of the system. Should be a
numeric vector with parameters
specified in the following order:
α,
β.
Michael J Grayling
vonBertalanffy evaluates the derivative of the following ODE at the
point (t, y):
dy/dt = αy2/3 - βy.
Its format is designed to be compatible with ode from
the deSolve package.
ode