optifix: optifix. Optimise with some fixed parameters

In bossMaps: Convert Binary Species Range Maps into Continuous Surfaces Based on Distance to Range Edge

Description

Like optim, but with option to fix some parameters.

Usage

optifix(parms, fixed, fn, gr = NULL, ..., method = c("Nelder-Mead", "BFGS",
  "CG", "L-BFGS-B", "SANN"), lower = -Inf, upper = Inf, control = list(),
  hessian = FALSE)

Arguments

parms	Parameters to potentially optimize in fn
fixed	A vector of TRUE/FALSE values indicating which parameters in parms to hold constant (not optimize). If TRUE, the corresponding parameter in fn() is fixed. Otherwise it's variable and optimised over.
fn	Function to optimize (same as in optim)
gr	Gradient function (same as in optim)
...	Further arguments to be passed to fn and gr.
method	Method to use for optimization (same as in optim)
lower	Lower limits (same as in optim)
upper	Upper limits (same as in optim)
control	Control list (same as in optim)
hessian	Return Hessian object (same as in optim)

Details

Originally written by Barry Rowlingson"

Value

Similar to optim but adds a vector of all the parameters and a vector copy of the 'fixed' argument.

Author(s)

Written by Barry Rowlingson October 2011

References

http://www.maths.lancs.ac.uk/~rowlings/R/Optifix/optifix.R

bossMaps documentation built on May 2, 2019, 3:57 p.m.