geoR (version 1.8-1)

.nlmP: Adapts nlm for Constraints in the Parameter Values

Description

This function adapts the R function nlm to allow for constraints (upper and/or lower bounds) in the values of the parameters.

Usage

.nlmP(objfunc, params, lower=rep(-Inf, length(params)),
      upper=rep(+Inf, length(params)), …)

Arguments

objfunc

the function to be minimized.

params

starting values for the parameters.

lower

lower bounds for the variables. Defaults to \(-Inf\).

upper

upper bounds for the variables. Defaults to \(-Inf\).

…

further arguments to be passed to the function nlm.

Value

The output is the same as for the function nlm.

Details

Constraints on the parameter values are internally imposed by using exponential, logarithmic, and logit transformation of the parameter values.

References

Further information on the package geoR can be found at: http://www.leg.ufpr.br/geoR.

See Also

nlm, optim.