logis: Logistic growth function

In nlraa: Non-linear regression for agricultural applications

Description

The logistic growth function corresponding to the SSlogis selfStart. This is Eq 2.1 in Table 1 in the paper referenced below.

Usage

logis(x, Asym, xmid, scal)

Arguments

x	a numeric vector of values at which to evaluate the model.
Asym	a numeric parameter representing the asymptote.
xmid	a numeric parameter representing the <e2><80><98>x<e2><80><99> value at the inflection point of the curve. The value of <e2><80><98>SSlogis<e2><80><99> will be <e2><80><98>Asym/2<e2><80><99> at <e2><80><98>xmid<e2><80><99>.
scal	a numeric scale parameter on the <e2><80><98>input<e2><80><99> axis.

Value

a numeric vector of length equal to the inputs

Author(s)

Fernando E. Miguez

References

Nonlinear Regression Models and Applications in Agricultural Research. Sotirios V. Archontoulis and Fernando E. Miguez. Agronomy Journal. doi: 10.2134/agronj2012.0506

See Also

SSlogis

Examples

logis(3, 20, 5, 1)

nlraa documentation built on May 2, 2019, 5 p.m.