saturation {EcoTroph}

Sigma Saturation Function

Description

This function enables an other calculation for the sigma of the create.smooth function. Sigma is calculated on the base of a saturation function reflecting a biological reasoning about the variability of the TL within trophic classes: the variability increases with the TL and reaches a plateau after a certain TL.

Usage

saturation(sigma_inf = NULL, coeff = NULL, pas = NULL)

Arguments

sigma_inf

defines the value of the curve's plateau.

coeff

defines the value of the slope.

pas

defines the splitting of the TL classes.

Details

By default sigma is constant. This function enables an other user choice reflecting a different reasoning.

Value

saturation returns a vector of values for the sigma used in the create.smooth function.

See Also

create.smooth function to create the Smooth, plot.smooth to plot the smooth function.

Examples

plot(saturation())
lines(saturation(0.2))
text(48,0.18,"sigma_inf=0.2")
lines(saturation(coeff=0.5))
text(48,0.35,"coeff=0.5")