gompertz.exp: Modified Gompertz growth law

In grofit: The package was developed to fit fit many growth curves obtained under different conditions.

Description

The function calculates the values of the modified Gompertz growth curve for given time points.

Usage

gompertz.exp(time, A, mu, lambda, addpar)

Arguments

time	Time points (x-axes) for which the function values will be returned
A	Maximum of the curve. If a vector is provided only the first entry is used.
mu	Maximum slope. If a vector is provided only the first entry is used.
lambda	Lag-phase. If a vector is provided only the first entry is used.
addpar	Numeric vector of size two, addpar[1] corresponds to scaling parameter α and addpar[2] corresponds to shifting parameter t_{shift}.

Details

The function follows the parametrization

A exp[-exp(mu exp(1)/A(lambda-t)+1)]+A exp(alpha(t-t_shift))

Value

Numeric vector giving the values of modified Gompertz growth law for numeric input vector time.

Examples

x <- 1:30
y <- gompertz.exp(x, 10, 2, 5, c(1,2))
plot(x,y)

Example output

grofit documentation built on May 30, 2017, 4:08 a.m.