nlmP: Adapts nlm for Constraints in the Parameter Values
Description
This function adapts the Rfunction 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 about geoR can be found at:
http://www.maths.lancs.ac.uk/~ribeiro/geoR.