Curve derivatives of eHOF models

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Description

Slope and inflection points for the eHOF model types.

Usage

1
Para_deriv(resp, newdata = NULL, model = NULL, p, type = c("slope", "inflection"), ...)

Arguments

resp

response model results, see HOF.

newdata

new gradient vector, if NULL a vector with 10000 values within gradient range will be used

model

response model type. If not specified, the output of pick.model will be used.

p

Vector of model parameters. If not specified, resp$models[[model]]$par will be used.

type

Output type: slope or inflection points of model curves

...

further arguments passed to or from other methods, e.g. for pick.model.

Value

For slope a vector of slopes for all newdata points. Inflection points are the extremes of the second derivative.

Author(s)

Florian Jansen

References

Peper, J., Jansen, F., Pietzsch, D., Manthey, M. 2011. Patterns of plant species turnover along grazing gradients. Journal of Vegetation Science 22: 457–466.