thetalogistic {primer}

Continuous Theta-Logistic Growth

Description

A function for continuous theta-logistic growth, for use with ode in the deSolve package.

Usage

thetalogistic(times, y, parms)

Arguments

times

Times points that will return N

y

N

parms

a vector of logistic growth parameters

Details

The user does not put these directly into this function, but rather uses ode in the deSolve package. See ode in the deSolve package.

Value

Returns of list of one component (required by ode).

Author(s)

Hank Stevens ([e-mail])

References

Sibly, R.M., Barker, D., Denham, M.C., Hone, J., and Pagel, M. (2005) On the regulation of populations of mammals, birds, fish, and insects. Science, 309, 607–610.

Stevens, M.H.H. (2009) A Primer of Ecology with R. Use R! Series. Springer.

See Also

clogistic

Examples

library(deSolve)
p <- c(r=1,alpha=.01, theta=.5)
time <- seq(1,10, by=.1)
initialN <- 10
out <- ode(y=initialN, times=time, func=thetalogistic, parms=p)
plot(time, out[,-1], type='l')