R: Adapts nlm for Constraints in the Parameter Values

.nlmP {geoR} | R Documentation

## 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`.

### Details

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

### Value

The output is the same as for the function `nlm`.

### Author(s)

Patrick E. Brown p.brown@lancaster.ac.uk.
Adapted and included in geoR by
Paulo Justiniano Ribeiro Jr. paulojus@leg.ufpr.br

### References

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

### See Also

`nlm`, `optim`.

[Package geoR version 1.7-5.2 Index]