Gz: Gz calculates predicted Gompertz length-at-age growth curve

In MQMF: Modelling and Quantitative Methods in Fisheries

Gz calculates predicted Gompertz length-at-age growth curve

Description

Gz calculates length-at-age for the Gompertz curve. This curve can have an inflection near the origin as well as at an age where growth slows due to maturity occurring.

Usage

Gz(p, ages)

Arguments

p	is a vector the first three values of which are a, b, c, for the Gz curve.
ages	is a vector of ages; could be a single number

Value

a vector of predicted lengths for a vector of ages in 'ages'

Examples

 ages <- seq(0,20,1)   # sigma is ignored here
 oldpar <- par(no.readonly=TRUE)
 pars <- c(a=26.0,b=2.8,c=-0.65,sigma=1.0) # a, b, c, sigma;
 plot1(ages,Gz(pars,ages),xlab="Age",ylab="Length",lwd=2)
 par(oldpar)

MQMF documentation built on Sept. 8, 2023, 5:14 p.m.