vonBertalanffy: The von Bertalanffy Growth Model

Description Usage Arguments Details Value Author(s) See Also

Description

The derivative function of the von Bertalanffy growth model, an example of a one dimensional autonomous ODE system.

Usage

1
vonBertalanffy(t, y, parameters)

Arguments

t

Value of t, the independent variable, to evaluate the derivative at. Should be a single number.

y

Value of y, the dependent variable, to evaluate the derivative at. Should be a single number.

parameters

Values of the parameters of the system. Should be a vector with parameters specified in the following order: alpha, beta.

Details

Evaluates the derivative of the following ODE at the point (t, y):

dy/dt = alpha*y^(2/3) - beta*y.

Format is designed to be compatible with ode from the deSolve package.

Value

Returns a list dy containing the value of the derivative at (t, y).

Author(s)

Michael J. Grayling

See Also

ode



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